kẻ điên rồ 
maniac, lunatic, crazy person [ kẻ ] : individual, single, person, man; to write (on a sign)
[ điên ] : mad, crazy, insane
[ rồ ] : (1) mad, crazy; (2) to accelerate, hasten
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
kẻ điên rồ maniac, lunatic, crazy person