How many movies have Lam Fai-Wong and Mou Tun-Fei collaborated on?

They have worked on 3 movies together! Their first movie together was The Criminals, Part 5: The Teenager's Nightmare (1977) while their highest rated movie together was Bank Busters (1978). They have not worked together since Bank Busters (1978). They are most known for their crime films together.