Vietnamese is the official language of the South East Asian country of Vietnam. As such, there are not a huge number of native Vietnamese speakers in the world. This means that a limited number of online casinos offer Vietnamese as a language option. However, there are some available and if you prefer to play online games in Vietnamese then you will be able to find a casino to meet your requirements.
Since Vietnamese isn't particularly widespread, online casinos in Vietnam generally support other languages too. It's not unusual to find English, Chinese, Japanese and Korean languages available. You should be able to change your language selection by clicking on a flag or finding your preferred language under the site's settings.
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Many online casinos operating in Vietnamese only accept players from the South East and East Asian area. If you're based outside this region then you may not be able to play. The registration page should tell you if players from your country of residence are welcome but if you can't find the information there it's best to contact the customer support service.
The vast majority of Vietnamese language casinos trade using the Vietnamese Dong. Some will also accept other local currencies such as the Chinese Yuan Renminbi, the Japanese Yen or the North and South Korean Won.You may also find casinos accepting US Dollars.
Players usually have a range of payment options including international and domestic e-wallets, credit/debit cards and payments made via money transfer services. Some payment methods do incur fees so it's worth checking the site's banking page before committing to a particular method of payment. Withdrawals can be made using e-wallets or credit/debit cards with some casinos offering the option of using paper cheques or money transfer services.