tra chìa vào khoá 
to insert a key in a lock [ tra ] : (1) to consult, look up; (2) to fit in; (3) to add; (4) to apply
[ chìa ] : (1) key; (2) to stretch out, extend, show, produce
[ vào ] : at, on (date), in, to; to enter, go in, access
Most Common Compounds Set 1:
Most Common Compounds Set 2:
Most Common Compounds Set 3 :
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