How many movies have Lowell Lo Koon-Ting and Sherman Chow Gam-Cheung collaborated on?

They have worked on 13 movies together! Their first movie together was Couples, Couples, Couples (1988) while their highest rated movie together was God of Gamblers (1989). They have not worked together since Handsome Siblings (1992). They are most known for their comedy films together.