How many movies have Chiang Hsing-Lung and Ng Hong-Sang collaborated on?

They have worked on 30 movies together! Their first movie together was Big Brother Cheng (1975) while their highest rated movie together was The Ghost Story (1979). They have not worked together since Hell Has No Boundary (1982). They are most known for their action films together.

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Panda (One of the Four Killers)
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One of the '7 Bitters'
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Shaolin recruit Gong Qian-Jin
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Tung Qian-jin, San Ta's Student
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Leader of 4 Swift swords
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Martial artist killed in prologue