một công đôi việc 
kill two birds with one stone [ một ] : one; a, an
[ công ] : (1) labor, effort, work; (2) (bank) account; (3) peacock; (4) duke; (5) wages, salary, pay; (6) fair, equal, just; (7) public, common; (8) to attack
[ đôi ] : pair, couple, two
[ việc ] : affair, thing, work, job, matter, business, idea
Most Common Compounds Set 1:
Most Common Compounds Set 2 :