This year, Viet Nam scored 5.411 points, up from the 5.353 it got last year, according to the report - a publication of the United Nations Sustainable Development Solutions Network first launched in 2012.

In Southeast Asia, Viet Nam was ranked fourth after Singapore (32), Thailand (53th) and the Philippines (60) but it was followed by Malaysia (79), Indonesia (80), Cambodia (98), Laos (100), and Myanmar (123). 

Finland continues to be the happiest country in the world this year for the fourth year in a row with an overall score of 7.842, followed by Denmark, Iceland and Switzerland.

Since 2002, the World Happiness Report has used statistical analysis to determine the world's happiest countries.

To determine the world's happiest country, researchers analyzed comprehensive Gallup polling data to monitor performance in six particular categories including gross domestic product per capita, social support, healthy life expectancy, freedom to make your own life choices, generosity of the general population, and perceptions of internal and external corruption levels./.