Credits: The Fearless Duo (1978)

[Gaijin84]

Chinese credits:
http://hkmdb.com/db/movies/credits.mhtml?id=10069&display_set=eng

[calros]

Very valuable info! added prod. co., prod. man., pres., phot., mus., ed., art dir., assist. dir., makeup and 5 actors.

[Michael Kistner]

Wong Bou-Kim looks like another alias for Pak Sha-Lik.

Ye Niu could be Yeung Hung.

Hsiao Tu could be in this movie To Wai-Wo

cast page:

http://www.angelfire.com/az/ying/castc/fdu.htm

[calros]

Could be, because Wong Bou-Kim appears in the other movie with Pak Sha-Lik, "The 36 Deadly Styles"
Same for Ye Niu, because he appears in the other movie with Yeung Hung, "Ferocious to Ferocious"
I prefer waiting for more clues.