đắt như tôm tươi 
to go or sell like hot cakes [ đắt ] : to be expensive
[ như ] : like, for example, as, such as, similar
[ tôm ] : prawn, shrimp
[ tươi ] : fresh; immediately, on the spot; cheerful, joyful, happy
Most Common Compounds Set 1:
Most Common Compounds Set 2 :