tiếng động cơ cổ 
sound of an engine [ tiếng ] : (1) language, sound, voice, reputation; (2) hour
[ động ] : to move, touch
[ cơ ] : (1) foundation; (2) occasion, opportunity, circumstance; (3) odd; (4) regiment; (5) machine, mechanism, motor, engine; (6) airplane; (7) hunger, famine; (8) muscle; (9) outburst, crisis
[ cổ ] : (1) neck, collar; (2) ancient, old, out of date, old fashioned; (3) drum; (4) merchant; (5) blind; (6) leg; (7) share, stock
Most Common Compounds Set 1:
Most Common Compounds Set 2 :