rồi sao 
well, what then? [ rồi ] : already, then, after that, afterwards, next
[ sao ] : how?, what manner?, why? (is that); to matter
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
rồi sao nữa and then what? rồi sao well, what then? rồi sao nữa and then what?