trơ như đá 
stiff as tone (to be unrepentant, unashamed) [ trơ ] : (1) shameless, brazen-faced; (2) inert
[ như ] : like, for example, as, such as, similar
[ đá ] : (1) stone, rock; (2) to kick
Most Common Compounds Set 1:
Most Common Compounds Set 2 :