-Handshake is the most common form of greeting somebody. Hand shaking among men is fine. Vietnamese woman may do so but they would rather not.
-Avoid public displays of affection with a member of the opposite sex.
-Do not touch someone's head.
-Do not point with your finger - use your hand.
-Do not pass anything over someone's head.
-Do not touch anyone on the shoulder.
-Do not touch a member of the opposite sex.