⚡ สรุปโดยย่อ:
- ตัวประกอบ: CyberGhost starts at $2.03/month on the 2 Years + 4 Month plan. Windscribe’s cheapest paid tier is $5.75/month.
- เหมาะสำหรับ: CyberGhost for streaming and a huge server network. Windscribe for a free plan and unlimited simultaneous connections.
- ความแตกต่างที่สำคัญ: CyberGhost sells streaming servers and dedicated IP. Windscribe sells flexibility, a free ยูวี tier, and the R.O.B.E.R.T. ad blocker.
- ตัวเลือกที่เราแนะนำ: CyberGhost for most people, because the server locations, refund window, and per-month cost all land in its favour.
One of these ยูวี providers gives you 9,200 servers. The other gives you a free plan that never expires.
That single split explains almost every other difference between them.
CyberGhost is built around scale, streaming sites, and a long refund window.
Windscribe is built around flexibility, unlimited data on paid tiers, and letting you pay only for what you use.
Here is how the two stack up on price, speed, privacy, and everyday use.
ภาพรวม
This CyberGhost vs Windscribe comparison covers pricing, server network size, streaming, privacy, and ความปลอดภัย คุณสมบัติ.
Both names are familiar in the vpn industry, but they chase different buyers.
Our sources are published specs, support documentation, and third-party speed tests.
Our writers also spent hands-on time inside both vpn apps.
บันทึกเหล่านั้นอยู่ในส่วน "สิ่งที่ทีมของเราสังเกตเห็น" ด้านล่างนี้
By the end you will know which vpn service fits your budget and your devices.
CyberGhost คืออะไร?
CyberGhost is a Romania-based vpn service launched in 2011.
It runs a huge server network of more than 9,200 servers in 126 locations across 100 countries.
The CyberGhost app sorts servers into tabs for streaming, torrenting, and gaming.
You get desktop and mobile apps for Windows, macOS, Android, แอป iOSและลินุกซ์
Most people pick it to hide their real ip address and watch region-locked streaming platforms.
CyberGhost’s servers are spread wide enough that one internet connection can hop between global servers in seconds.
Here is a walkthrough of CyberGhost’s client before we get into pricing.
🏆 ผู้ชนะ: CyberGhost
Our top pick for streaming and server choice. Servers built for BBC iPlayer and Amazon Prime Video. Refunds run 45 days on long plans.
ราคาของ CyberGhost
CyberGhost sells three plans. The longer you commit, the lower the monthly rate drops.
| วางแผน | ราคา | เหมาะสำหรับ |
|---|---|---|
| 1 เดือน | 12.99 ดอลลาร์สหรัฐฯ ต่อเดือน | Short trips and one-off streaming |
| 6 เดือน | 6.99 ดอลลาร์สหรัฐฯ ต่อเดือน | Testing before a long commitment |
| 2 ปี 4 เดือน | 2.03 ดอลลาร์สหรัฐฯ ต่อเดือน | Households that want the lowest cost |
Pricing verified September 2026.
ทดลองใช้งานฟรี: Short free trials run on PC, แอนดรอยด์, and iOS. No free tier exists after that.
รับประกันคืนเงิน: The 45 day money back guarantee applies to the six-month and two-year plans. The one-month plan drops to 14 days.
📌 บันทึก: A dedicated ip costs an extra $5 billed monthly. CyberGhost accepts Bitcoin, credit card, PayPal, and Google Pay, so you can keep payment details off your main account.
⚠️ คำเตือน: The two-year plan is billed as $57 for the first 28 months, then renews yearly at $57. Set a calendar reminder before renewal if CyberGhost vpn deals change.
ประโยชน์หลักของ CyberGhost
Here is what the CyberGhost vpn does better than most vpn providers:
- Server scale: 9,200+ CyberGhost servers across 100 countries. Virtual locations fill gaps where physical hosting is hard.
- Streaming tab: Dedicated servers cover Netflix, BBC iPlayer, ฮูลู, Amazon Prime, Disney Plus, HBO Max, Peacock, and Paramount Plus.
- Audited no-logs: Deloitte audited the no-logs claim twice, in 2022 and again in January 2024. No connection logs are kept.
- NoSpy servers: CyberGhost owns and operates these itself in Romania, outside the 14-Eyes alliance.
- กฎอัจฉริยะ: Set the vpn app to automatically connect when you open a browser or join an unsecured network.
- Wide device support: แอป CyberGhost สำหรับ Windows แมก app, ios app, and Android app, plus Linux, Amazon Fire TV and smart tvs. CyberGhost’s mobile apps also cover Android TV and Apple TV.
- Security suite extras: A built-in ad, tracker, and malware blocker plus an automatic kill switch that cuts internet access if the vpn tunnel drops. A mobile device on public wi-fi gets the same protection.
สิ่งที่ทีมของเราสังเกตเห็น
ของเรา นักเขียน signed up for CyberGhost and used it across a laptop, a phone, and a smart tv. Here is what stood out from that hands-on time:
ข้อดีและข้อเสียของ CyberGhost
✅ ข้อดี
- Over 9,200 servers in 126 locations across 100 countries
- 45 day money back guarantee on six-month and two-year plans
- No-logs policy audited by Deloitte in 2022 and January 2024
- RAM only servers wipe data on every reboot
- Streaming servers cover more than 15 Netflix libraries
❌ ข้อเสีย
- Average speed loss sits near 30 percent, slower than top rivals
- Distant servers have shown up to 60 percent speed loss
- Reviewers report buggy apps that affect day-to-day use
- Capped at up to seven devices per account
Windscribe คืออะไร?
Windscribe is a Canadian vpn service known for its generous free plan.
Windscribe servers sit in over 110 cities across 66 countries.
The free version gives you 10GB of data a month when you register an email address.
Paid tiers add unlimited data and access to every location.
Windscribe apps cover Windows, Mac, Android, iOS, and Linux, plus browser extensions.
Windscribe’s apps share one login, and the Windows version carries the most settings.
Watch how the desktop app and the free service work together.
Runner Up: Windscribe
The pick if you want a free vpn that actually works. Unlimited simultaneous connections on every tier. Build A Plan lets you pay $1 per location.
ราคาของ Windscribe
Windscribe subscription options are unusual. You can buy a normal plan or build your own.
| วางแผน | ราคา | เหมาะสำหรับ |
|---|---|---|
| สร้างแผน | กำหนดเอง | Light users who need two or three locations |
| แผนรายเดือน | 9.00 ดอลลาร์/เดือน | Trying Windscribe Pro with no lock-in |
| แผนรายปี | 5.75 ดอลลาร์สหรัฐฯ ต่อเดือน | Full unlimited data at the lowest rate |
Pricing verified September 2026.
ทดลองใช้งานฟรี: No trial is needed. The free plan gives 10GB of data monthly with an email, or 2GB without one.
รับประกันคืนเงิน: Windscribe’s money back guarantee lasts three days and only applies if you used under 10GB.
📌 บันทึก: Build A Plan costs $1 per location with a two-location minimum. Each location adds 10GB of monthly data. Payment works by credit card, PayPal, Bitcoin, other คริปโต, and gift cards.
⚠️ คำเตือน: Three days is a short refund window. Test the free plan hard before you pay, and watch for Windscribe deals around the annual tier.
ประโยชน์หลักของ Windscribe
Here is where the Windscribe vpn pulls ahead:
- สามารถเชื่อมต่อพร้อมกันได้ไม่จำกัดจำนวน: Free and paid users both get unlimited connections. No device cap anywhere.
- โรเบิร์ต: A customisable DNS and IP level ad blocker that can block ads, trackers, and malware domains.
- ความเร็ว: Published tests put OpenVPN at 270-330Mbps and WireGuard past 950Mbps on a fast line.
- การขุดอุโมงค์แบบแยกส่วน: Choose which apps and which browser traffic use the vpn connection.
- Firewall kill switch: What Windscribe calls a Firewall blocks internet access the moment the vpn connection drops.
- DNS แบบกำหนดเอง: You decide which DNS resolves your dns queries when connected and when disconnected.
- Anonymous sign-up: Since late 2025 you can create an account with a randomly generated hash instead of an email or password.
สิ่งที่ทีมของเราสังเกตเห็น
Our writer ran Windscribe on Windows and on Microsoft Edge for a stretch of everyday browsing. Here is what came out of it:
ข้อดีและข้อเสียของ Windscribe
✅ ข้อดี
- Free plan gives 10GB of data every month
- Unlimited simultaneous connections on free and paid tiers
- WireGuard speeds measured above 950Mbps
- R.O.B.E.R.T. blocks ads, trackers, and malware at DNS level
- Build A Plan starts at $1 per location
❌ ข้อเสีย
- Around 500 servers, far fewer than NordVPN’s 8,800
- Canada sits inside the Five Eyes Alliance
- Refund window is only three days and under 10GB used
- Free servers run about 15 percent slower than paid ones
เปรียบเทียบคุณสมบัติ
We compared eleven areas that matter to normal vpn users. The table gives you the short version.
| คุณสมบัติ | ไซเบอร์โกสต์ | วินด์สไครบ์ |
|---|---|---|
| ราคาเริ่มต้น | 2.03 ดอลลาร์สหรัฐฯ ต่อเดือน | 5.75 ดอลลาร์สหรัฐฯ ต่อเดือน |
| แผนฟรี | ❌ | ✅ 10GB monthly |
| เครือข่ายเซิร์ฟเวอร์ | ✅ 9,200+ servers | ❌ Around 500 servers |
| Simultaneous Device Connections | ❌ Seven | ✅ ไม่จำกัด |
| Dedicated IP / Static IP | ✅ $5 extra monthly | ✅ Static ip addresses |
| บล็อคโฆษณา | ✅ Content blocker | ✅ โรเบิร์ต |
| การแยกขอบเขต | ✅ Windows and Android | ✅ Apps and browser traffic |
| ส่วนขยายเบราว์เซอร์ | ❌ | ✅ Chrome, Firefox, Edge |
| ช่วงเวลาขอคืนเงิน | ✅ 45 days | ❌ Three days |
| เหมาะสำหรับ | Streaming and server choice | Free vpn use and many devices |
1. เครือข่ายเซิร์ฟเวอร์และตำแหน่งที่ตั้ง
ไซเบอร์Ghost: More than 9,200 servers sit in 126 locations across 100 countries. You rarely fight for a crowded vpn server. Some entries are virtual locations, where the ip address maps to a country CyberGhost does not host in.
คําบอกรับ: Around 500 vpn servers cover 110+ cities in 66 countries. That is well under NordVPN’s 8,800, but city-level choice is good. Free users reach fewer server locations.
2. Streaming and Unblocking
ไซเบอร์Ghost: A Streaming tab in the sidebar lists servers tuned for single platforms. Coverage runs to 15+ Netflix libraries, BBC iPlayer, Now TV, Amazon Prime Video, Disney Plus, Hulu, Peacock, RTVE, DRTV, and TV4Play. Those streaming sites are re-tested often, so the major streaming services keep working.
คําบอกรับ: No special streaming tab, but results are strong anyway. Published tests unblocked every Netflix library tried, plus BBC iPlayer, ITV, Channel 4, Prime Video, Hulu, and Disney Plus. The free version hits its data limit after roughly seven hours of video.
⚠️ คำเตือน: Streaming platforms rotate blocks constantly. Both vpn services work today, but no provider can promise a specific library next month.
3. Connection Speeds, Gaming and Torrenting
ไซเบอร์Ghost: Average speed loss is around 30 percent, which is slower than the fastest vpn providers. WireGuard has hit 760 Mbps on nearby servers. Distant servers are the weak spot, with tests showing up to 60 percent loss. Gaming and torrenting get their own server lists.
คําบอกรับ: All the usual vpn protocols are here, and OpenVPN UDP delivers 270-330Mbps while WireGuard has passed 950Mbps. Loss was 19 percent on nearby servers and 31 percent on distant ones. Download speeds on free servers run about 15 percent below paid. Connections settle in a few seconds, often one to two.
4. Privacy, Logging and Jurisdiction
ไซเบอร์Ghost: Romania sits outside the 14-Eyes alliance. Deloitte audited the no-logs policy in 2022 and again in January 2024. Ram only servers wipe on reboot, and transparency reports cover legal requests. No connection details about your online traffic are kept. Some reviewers still คำถาม data sharing with the parent company.
คําบอกรับ: The privacy policy rules out activity logs and browsing history. Total bandwidth and a last-activity timestamp live in RAM and vanish after the session. Canada is the catch, since it belongs to the Five Eyes Alliance. Audits have found no major issues.
5. Ad, Tracker and Malware Blocking
ไซเบอร์Ghost: The Windows app bundles an ad, tracker, and malware blocker that drops known bad domains. A Security Updater flags outdated software on your machine. Blocking is on or off, with no per-rule control.
คําบอกรับ: R.O.B.E.R.T. blocks at DNS and IP level, and you pick which lists run. You can block ads, malware, social trackers, crypto miners, or your own custom domains. It works inside Windscribe’s browser extensions too.
6. ระบบ Kill Switch และการป้องกันการรั่วไหลของ DNS
ไซเบอร์Ghost: An automatic kill switch cuts internet traffic if the tunnel fails, with no toggle to forget. DNS leak protection keeps dns queries inside the tunnel. CyberGhost’s malicious url filter blocks flagged pages before they load.
คําบอกรับ: The kill switch is called Firewall and blocks internet access when the connection drops. DNS and IP leak protection are built in, and a browser-based dns leak test lets you confirm there are no dns leaks. You can also rotate the reported MAC address on Windows.
7. การรองรับอุปกรณ์และการเชื่อมต่อพร้อมกัน
ไซเบอร์Ghost: Apps cover Windows, macOS, Linux, the Android app, and the ios app, plus Android TV, Apple TV, Amazon Fire TV, and smart tvs. A smart dns feature handles devices that cannot run a vpn app. The cap is up to seven devices at once.
คําบอกรับ: Desktop apps, mobile apps, and browser extensions all come with unlimited simultaneous connections. Config เครื่องกำเนิดไฟฟ้า create manual profiles for routers and boxes without native support, though those act as a proxy server rather than a full vpn tunnel.
8. Dedicated IP and Static IP
ไซเบอร์Ghost: A dedicated ip costs $5 billed monthly on top of your plan. It uses a token system so CyberGhost cannot tie the ip to your account. Useful for banking sites that flag shared ip addresses.
คําบอกรับ: Static ip addresses are sold as add-ons, including residential options. Port forwarding is available on a static ip, which matters for seeding and self-hosting. You can also pick a random port for the connection.
9. Live Sports and Smart DNS
ไซเบอร์Ghost: Sports servers are listed by event and region, so you connect to the right country without guessing. Smart DNS pushes the same access to a smart tv or console that cannot install CyberGhost’s apps. This is where the huge server network earns its keep.
คําบอกรับ: There is no sports catalogue and no smart dns. You pick a city and test it yourself. For a wi fi hotspot at a stadium or cafe, the Firewall plus auto-connect covers the security side.
10. Split Tunneling and Local Network Traffic
ไซเบอร์Ghost: Split tunneling exists on the Windows app and the Android app only. Mac app and ios app users send everything through the tunnel. Smart Rules can automatically connect to a chosen server when a named app launches.
คําบอกรับ: The Windows client splits vpn traffic by app, by IP, or by hostname. Local network traffic can stay off the tunnel so printers and NAS drives keep working. The browser extension adds cookie, user agent, and location controls that the desktop app does not have.
11. การกำหนดราคาและต้นทุน
Here are both price lists side by side.
| ชั้น | ไซเบอร์โกสต์ | วินด์สไครบ์ |
|---|---|---|
| ฟรี | ❌ ไม่มีบริการฟรี | ✅ 10GB of data monthly |
| รายเดือน | 12.99 ดอลลาร์สหรัฐฯ ต่อเดือน | 9.00 ดอลลาร์/เดือน |
| ระยะกลาง | $6.99/month (6 Months) | Build A Plan: Custom |
| ระยะยาว | $2.03/month (2 Years + 4 Month) | $5.75/month (Yearly Plan) |
ไซเบอร์Ghost: The two-year rate of $2.03/month is the cheapest number in this comparison. The trade-off is a long commitment and a renewal that jumps afterwards. Month-to-month is the priciest option here.
คําบอกรับ: $5.75/month on the yearly plan buys unlimited data and every location. Build A Plan is the clever bit: pay $1 per location, minimum two, and each one adds 10GB. Nobody else prices a premium vpn that way.
สถานการณ์ต่างๆ
| หากคุณต้องการ... | เลือก | ทำไม |
|---|---|---|
| To pay nothing | วินด์สไครบ์ | รับเน็ตฟรี 10GB ทุกเดือน |
| ราคาต่ำสุดในระยะยาว | ไซเบอร์โกสต์ | $2.03/month on two years |
| Streaming on a smart tv | ไซเบอร์โกสต์ | Smart DNS and streaming servers |
| Cover ten-plus devices | วินด์สไครบ์ | การเชื่อมต่อไม่จำกัด |
| A long refund window | ไซเบอร์โกสต์ | 45 days versus three |
| Fine-grained ad control | วินด์สไครบ์ | R.O.B.E.R.T. custom rules |
💰 งบประมาณของคุณ
Commit for two years and CyberGhost is far cheaper per month. Want zero spend? The Windscribe free service is the only real option.
🔌 อุปกรณ์เทคโนโลยีของคุณ
Routers, consoles, and older smart tvs favour CyberGhost thanks to smart dns. Browser-first workers favour Windscribe, since the extension works in Chrome, Firefox, and Microsoft Edge.
📺 พฤติกรรมการรับชมสตรีมมิ่งของคุณ
Heavy watchers who switch country libraries will like the CyberGhost sidebar. Occasional viewers get by on Windscribe’s normal servers.
🎓 ระดับประสบการณ์ของคุณ
Beginners find the CyberGhost app easier, since servers are sorted by purpose. Windscribe rewards people who enjoy tuning advanced features.
🆓 ทดลองใช้งานและเดโมฟรี
Windscribe needs no trial because the free plan never expires. CyberGhost offers short trials on PC, Android, and iOS.
🛟 ตัวเลือกการสนับสนุน
CyberGhost runs 24/7 live chat support, email, and a knowledge base reviewers call thin. Windscribe leans on tickets and docs.
คู่มือการสลับใช้งาน
Already paying for one of them? Here is what changes.
🔄 Switching from CyberGhost to Windscribe?
✅ สิ่งที่คุณจะได้รับ:
- Unlimited simultaneous connections instead of a seven-device cap
- A free plan you can fall back on between subscriptions
- Faster WireGuard throughput and browser extensions with extra controls
❌ สิ่งที่คุณจะสูญเสีย:
- The 9,200-server network and virtual locations
- Streaming and sports servers sorted by platform
- The 45-day refund window and smart dns
📋 วิธีการเปลี่ยน:
- Claim your CyberGhost refund inside the 45-day window
- Create a free Windscribe account and test 10GB first
- Upgrade to the yearly plan, then set up R.O.B.E.R.T. and split tunneling
🔄 Switching from Windscribe to CyberGhost?
✅ สิ่งที่คุณจะได้รับ:
- Servers tuned per streaming platform, plus a sports catalogue
- A much lower monthly cost on the two-year term
- Romania jurisdiction and two Deloitte audits
❌ สิ่งที่คุณจะสูญเสีย:
- Unlimited device connections and the free tier
- R.O.B.E.R.T. and its custom blocking rules
- Build A Plan pricing and port forwarding on a static ip
📋 วิธีการเปลี่ยน:
- Note the Windscribe locations you actually use
- Buy the CyberGhost plan that matches your commitment level
- Install the desktop apps, set Smart Rules, and confirm the kill switch is on
สิ่งที่บทวิจารณ์ของเราไม่ได้กล่าวถึง
We focused on home and solo use. We did not test ธุรกิจ accounts, router firmware, or reliability in heavily censored countries. Speed figures come from published tests on fast lines, not your ISP. Team buyers will weigh things differently.
คุณสมบัติสุดท้าย
| หมวดหมู่ | ผู้ชนะ |
|---|---|
| 💰 ราคา | ไซเบอร์โกสต์ |
| 🌍 เครือข่ายเซิร์ฟเวอร์ | ไซเบอร์โกสต์ |
| 📺 สตรีมมิ่ง | ไซเบอร์โกสต์ |
| ⚡ ความเร็ว | วินด์สไครบ์ |
| 🔒 Privacy and Jurisdiction | ไซเบอร์โกสต์ |
| 🛡️ การบล็อกโฆษณา | วินด์สไครบ์ |
| 📱 Device Coverage | วินด์สไครบ์ |
| 🏆 ผู้ชนะเลิศโดยรวม | ไซเบอร์โกสต์ |
🏆 ผู้ชนะ: CYBERGHOST
CyberGhost wins 4 of 7 categories.
เหมาะสำหรับ: Streaming abroad, smart tv households, and anyone who wants the lowest monthly price.
The final verdict CyberGhost earns here is not a blowout. It wins because the server network, streaming servers, and price all point the same way.
Windscribe is the better buy in two cases: if you need a free vpn, or if you cover more than seven devices.
Speed favours Windscribe too. For most households, coverage and cost decide it.
เปรียบเทียบ CyberGhost เพิ่มเติม
Here is how the CyberGhost vpn lands against its closest rivals.
CyberGhost ชนะในด้าน: Lower two-year rate, a 45-day refund versus 30, and more country coverage at 100.
NordVPN ชนะในด้าน: Faster average throughput, Panama jurisdiction, and extras like Threat Protection and Meshnet.
ไซเบอร์โกสต์ ปะทะ ExpressVPN
CyberGhost ชนะในด้าน: Price per month, purpose-built streaming lists, and a cheaper dedicated ip add-on.
ExpressVPN ชนะในด้าน: Lower speed loss on distant servers, steadier apps, and router firmware support.
CyberGhost เทียบกับ Private Internet Access
CyberGhost ชนะในด้าน: Better beginner interface, streaming server labels, and NoSpy servers it owns outright.
การเข้าถึงอินเทอร์เน็ตส่วนตัว ชนะการแข่งขัน: Unlimited device connections, open-source clients, and court-tested no-logs history.
ไซเบอร์โกสต์ ปะทะ เซอริฟชาร์ก VPN
CyberGhost ชนะในด้าน: Larger raw server count, the longer refund window, and per-platform streaming servers.
Surfshark ชนะการแข่งขันในด้านต่างๆ ดังนี้: Unlimited devices, stronger speeds on long routes, and a cleaner mobile experience.
เปรียบเทียบ Windscribe เพิ่มเติม
And here is where Windscribe sits against the rest of the field.
วินด์สไครบ์ ปะทะ โปรตันVPN
Windscribe ชนะด้วย: Unlimited connections, R.O.B.E.R.T. custom blocking, and Build A Plan pricing.
ProtonVPN ชนะในด้าน: Swiss jurisdiction, a free tier with no data limit, and fully open-source audited apps.
Windscribe ชนะด้วย: A real free plan, transparent renewal pricing, and higher WireGuard throughput.
PureVPN ชนะการแข่งขัน: Far more server locations, 24/7 live chat support, and always-on third-party audits.
วินด์สไครบ์ ปะทะ Ad Card VOPN
Windscribe ชนะด้วย: Larger free allowance, port forwarding on static ip, and deeper split tunneling rules.
AdGuard VPN ชนะในด้าน: Tighter pairing with its own ad blocker, lower entry price, and a lighter mobile build.
Windscribe ชนะด้วย: Predictable pricing, faster and steadier servers, and proper desktop and mobile apps.
มิสเตอรียม ชนะการแข่งขัน: Pay-as-you-go billing, a decentralised node network, and residential exit ip addresses.
ถาม บ่อย ๆ
สามารถไว้วางใจ CyberGhost VPN ได้หรือไม่?
Deloitte audited the no-logs policy twice, in 2022 and January 2024. Servers run RAM-only, and transparency reports are published. Some reviewers still flag parent-company data sharing.
Windscribe VPN ฟรีจริงหรือเปล่า?
Yes. Register an email and you get 10GB of data monthly, or 2GB without one. Speeds run about 15 percent below paid servers.
CyberGhost มีค่าบริการรายเดือนเท่าไหร่?
It costs $12.99 monthly, $6.99 on six months, and $2.03 on the 2 Years + 4 Month plan. A dedicated ip adds $5 monthly.
Windscribe มาจากประเทศอะไร?
Canada. That places it inside the Five Eyes Alliance, which is the main privacy trade-off. No activity logs or browsing history are stored.
VPN ไหนดีกว่าสำหรับการสตรีมมิ่ง?
CyberGhost, by a clear margin. Its Streaming tab lists servers per platform for BBC iPlayer, Hulu, and 15+ Netflix libraries. Windscribe unblocks them but needs manual testing.
English 
Spanish 
Chinese 
German 
French 
Arabic 
Russian 
Portuguese 
Japanese 
Korean 
Italian 
Turkish 
Dutch 
Polish 
Indonesian 
Thai 
Vietnamese 