How many movies have Cheung Sum and John Cheung Ng-Long collaborated on?

They have worked on 4 movies together! Their first movie together was Mantis Fists & Tiger Claws of Shaolin (1977) while their highest rated movie together was Snake in the Monkey's Shadow (1979). They have not worked together since Two Wondrous Tigers (1980). They are most known for their action films together.