This appears to be the same film as the Golden Harvest doc they placed on the Region 1 DVDs, the one with tons of Western actors.
http://www.imdb.com/title/tt0075788/
My brother owns a copy of "Bruce Lee - The Legend" from Megastar from a few years ago which I orginally estimated came out in 1978, and I think is the same. I couldn't find a copy at YesAsia but there are titles from Widesight and Universe who seems to be the same.
This is the JPG for what appears to be the basis for the HKMDB row (from Universe):
In any case, more can be done to fill out the cast/director of this title.