like: cốt cán
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BEGINNER LEVEL
exact:
VNEN 
cốt cán * ☊ 
loyal party member, core member (of a group); major, key * ☊
[ cốt ] : (1) to aim at, be essential, essence; (2) bone, framework
[ cán ] : (1) to manage, attend to; (2) to grind; (3) handle, rod, staff, grip; (4) talent, skill