hi dragonbone,
I am Vietnamese and Im living in Malaysia, I go back VietNam every 2-3 months. For your information, definitely you can
vape at the public place with your confidence. Hard to see some one
vaping in vietnam but it is allowed as smoking is very popular.
About the customs, sure there is no issue with them if you keep your things in the luggage (dont keep in your hand bag), don't bring more than 200ml liquid to avoid attention of the customs. less than 200ml is allowed just like perfume.
Here is some website you can
buy in Vietnam, just call them, they will bring to your door.
Thuoc La Dien Tu, Thu
S
Thuoc la dien tu - Thu