How many movies have Eric Tsang Chi-Wai and Richard Lo collaborated on?

They have worked on 6 movies together! Their first movie together was The Reincarnation of Golden Lotus (1989) while their highest rated movie together was He Ain't Heavy, He's My Father (1993). They have not worked together since He Ain't Heavy, He's My Father (1993). They are most known for their comedy films together.