điều cần biết 
information [ điều ] : (1) thing, matter, item; article (of penal code, constitution); (2) smoking pipe; (3) bird [=chim]
[ cần ] : (1) to be urgent, pressing; to need (to), want; to care; (2) hard working, industrious; (3) rod, pole, staff; (4) celery
[ biết ] : to know, know how to do (something) be aware of
Most Common Compounds Set 1:
Most Common Compounds Set 2 :