làm cái gì 
to do what, how [ làm ] : to do, work, make, function as, serve; to cause something to happen
[ cái ] : (1) [CL for most inanimate objects, isolated events]; (2) object, thing; (3) female; (4) main, principle; (5) solid substances in soup (as opposed to nước, the liquid, broth)
[ gì ] : what
Most Common Compounds Set 1:
Most Common Compounds Set 2 :