nhớ lại dĩ vãng 
to go back to the past [ nhớ ] : to remember, recall, miss
[ lại ] : (1) again; against, over again, back towards; resume, re-; (2) to come, reach, get to; (3) (indicates something is contrary to expectations)
[ dĩ ] : to take, employ, use
Most Common Compounds Set 1:
Most Common Compounds Set 2 :