ngu xuẩn 
stupid, dumb, slow-witted, foolish [ ngu ] : (1) foolish, stupid; (2) the Emperor Yu, who ruled China from 2204-2197 BC
[ xuẩn ] : dull-witted, stupid
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
ngu xuẩn stupid, dumb, slow-witted, foolish