How many movies have Teddy Yip Wing-Cho and Yank Wong Yan-Kwai collaborated on?

They have worked on 4 movies together! Their first movie together was Mr. Boo Meets Pom Pom (1985) while their highest rated movie together was Blade of Fury (1993). They have not worked together since The Stunt Woman (1996). They are most known for their action films together.