đen như cái mỏm chó 
black as night [ đen ] : black
[ như ] : like, for example, as, such as, similar
[ 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)
[ mỏm ] : cape, tip, top, peak; muzzle, snout
[ chó ] : dog
Most Common Compounds Set 1:
Most Common Compounds Set 2 :