tối như hũ nút 
pitch-dark, pitch-black [ tối ] : (1) night, evening, dark; (2) very
[ như ] : like, for example, as, such as, similar
[ hũ ] : jar
[ nút ] : cork, stopper, node; button
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
tối như hũ nút pitch-dark, pitch-black