khỏi phải 
to can’t help but, can’t avoid, not need to [ khỏi ] : (1) to avoid, escape from, not help but (do sth); (2) to recover (from illness)
[ phải ] : (1) correct, right (opposite of left), right (opposite of wrong); (2) must, have to
Most Common Compounds Set 1:
Most Common Compounds Set 2 :