How many movies have Andrew Lau Wai-Keung and Ronny Ching Siu-Lung collaborated on?

They have worked on 6 movies together! Their first movie together was As Tears Go By (1988) while their highest rated movie together was Chungking Express (1994). They have not worked together since Young and Dangerous: The Prequel (1998). They are most known for their crime films together.