thừa cơ 
to seize a chance, take advantage of an occasion [ thừa ] : (1) left over, superfluous, extra; (2) to take advantage of; (3) to inherit; (4) to receive (from above); (5) to take charge; (6) to help, assist
[ 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
Most Common Compounds Set 1:
Most Common Compounds Set 2 :