nổi chìm 
full of vicissitudes, full of ups and downs [ nổi ] : (1) to rise, surface, become; in relief; (2) to be able to
[ chìm ] : to sink (a ship), become submerged; hidden, concealed
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
cuộc đời nổi chìm a life full of ups and downs