How many movies have Andrew Lau Wai-Keung and Tony Miu Kin-Fai collaborated on?

They have worked on 11 movies together! Their first movie together was Millionaires' Express (1986) while their highest rated movie together was Against All (1990). They have not worked together since He Ain't Heavy, He's My Father (1993). They are most known for their comedy films together.