Vietnamese people may come across as relatively passive, however they also give off a strong sense of drive, especially with life goals.
Unlike most Eastern societies, in Vietnam, clan takes precedence over the family.
Clubs tend not to be like their western counterparts; instead of people standing around and mingling, there are many rows of tables where people just sit and chat. Dance floors are also rare.
When entering somebody’s house, you must take your shoes off.
Motorbikes are the most common form of transportation. However, be warned that motorbikes are very dangerous as a passenger.

https://www.cia.gov/library/publications/the-world-factbook/geos/vm.html (Majority of information)
https://www.gso.gov.vn/default.aspx?tabid=714 (City population data)
Wolfram|Alpha (Currency exchange data)
Information accurate to best of ability as of 27 December 2016