đồi phong bại tục 
immoral, depraved customs [ đồi ] : hill
[ phong ] : to give, bestow, confer
[ bại ] : to lose, fail, be defeated
[ tục ] : coarse; custom; to continue, go on
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
đồi phong bại tục immoral, depraved customs