trước sự ngạc nhiên của tôi 
to my surprise [ trước ] : before, in front, previously; faced with, in the face of, ahead of
[ sự ] : deed, act, action event, occurrence, (classifier for actions, states)
[ ngạc ] : palate; crocodile
[ của ] : (1) (possessive marker), of; (2) property, possessions, belonging; (3) belong to
[ tôi ] : I (first person singular pronoun)
Most Common Compounds Set 1:
Most Common Compounds Set 2 :