cho biết không chính thức 
to unofficially report [ cho ] : add, give; to, for; to say, claim; in order to; let, allow, permit
[ biết ] : to know, know how to do (something) be aware of
[ không ] : (1) no, not; (question tag); (2) air; (3) empty
[ chính ] : main, principle, chief; self, own; exactly, just, precisely
[ thức ] : (1) manner, form, pattern; (2) to wake, awaken
Most Common Compounds Set 1:
Most Common Compounds Set 2 :