cầm câu cơm 
means of livelihood, way of making a living [ cầm ] : (1) to hold, take hold of, arrest, capture; (2) to pawn; (3) guitar, lute, musical instrument; (4) bird
[ câu ] : (1) phrase, expression, sentence; (2) to fish, go fishing
[ cơm ] : rice, cooked rice, food (in general)
Most Common Compounds Set 1:
Most Common Compounds Set 2 :