How many movies have Alric Ma Siu-Mang and Peter Cheung Yiu-Chung collaborated on?

They have worked on 4 movies together! Their first movie together was The Owl vs Bombo (1984) while their highest rated movie together was Righting Wrongs (1986). They have not worked together since Righting Wrongs (1986). They are most known for their action films together.