Introduce them to Buddhism
lol...most modern buddhists are rich people living in the west... Those still living in tibet are wondering why nobody cares about them and slowly but surely, for those who didnt kill themselves, adapt to the chinese society imported there willingly in order to assimilate them.
Also it's pretty easy to be happy when you re the dalai lama, spoonfed and considered a deity by a staff that will do everything for you every single day. Now aplying buddhism to everyday life is just plain impossible in our modern societies, chinese one included.
Purpose of life is not hapiness, it is to survive, this is why buddhists didnt adapt and are disapearing.