How many movies have Eric Tsang Chi-Wai and Tsang-Hei Chiu collaborated on?

They have worked on 4 movies together! Their first movie together was He's a Woman, She's a Man (1994) while their highest rated movie together was Comrades, Almost a Love Story (1996). They have not worked together since And I Hate You So (2000). They are most known for their romance films together.