1. Never take a photo with three people on the streets of Vietnam. You know, the relationship between Vietnam and China is very deep. Vietnam has been a vassal state of China since ancient times, so Vietnam is deeply influenced by the traditional culture of China, so you will find many ancient Chinese characters in Vietnam.

2. RMB can't be spent casually in Vietnam. The first currency of Vietnam is the Vietnamese dong, and the second currency is the US dollar. The liquidity of RMB in Vietnam is not high. For example, if you eat and stay in Vietnam, you will find two price signs, one is the Vietnamese dong and the other is the US dollar.

3. Stop taxis at will on the streets of Vietnam. Taxis in Vietnam are similar to those in China. Although there are regular taxi companies, there are also a large number of black cars.

4. Don't stare at Vietnamese beauties all the time. Miss Viet Nam is notoriously beautiful and lovely. That kind of pure natural beauty should be rare in China now! But don't stare at your little sisters just because they are beautiful. During the day, if you see a beautiful lady in the street, it's okay to look at it more.

Never take part in gambling in Vietnam. There are some famous casinos in some places in Vietnam, just like the "one-day tour in Mang Street" route, and there are some well-designed gambling games. Some tourists will also participate in gambling because they can't control their inner desires after seeing it. Of course, ten bets and nine losses, we'd better not touch these, otherwise it's useless to regret after being cheated.