This is from the Ranking Happiness Report 2015-2017, https://s3.amazonaws.com/happiness-report/2018/WHR_web.pdf.
Vietnam is ranked 95th, out of 156 countries. This belongs to the second half of the list.
No countries from Southeast Asia is ranked in the top 25. Taiwan is ranked 26th is the top countries from Southeast Asia.
There are 4 countries that are between 26th and 50th range.

There are 3 countries ranked between 51 to 75.

There are 4 countries ranked between 76 to 100

2 countries ranked between 101 to 125

Surprisingly, India is below 125th rank; Same is with Myanmar.
