căn cơ 
economical, thrifty [ căn ] : (1) apartment, flat; (2) [CL for houses, apartments, rooms]; (3) cause, origin, root
[ 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 :