Dress conservatively wherever possible.
Use both hands to pass things.But do not pass anything over someone's head.
Take your shoes off at the entrance if you're invited to a Vietnamese's home.
Ask for permission when taking a photograph of someone.
Store your cash, credit cards, airline tickets and other valuable things in a safe place.
Try to learn a couple of basic Vietnamese phrases.
Do not:
Cause Vietnamese to lose face.
Talk about the Vietnam War.
Carry large amount of money or wear a lot of jewelry.
Sit with your feet pointing towards people.
Discuss politics or religion with the Vietnamese.
Touch someone head and point with your finger.
Lose your temper in public.