This is from the US "Eastern Heroes" release, hence the edited in "Long Step Mantis" title. The original "Dynamite Trio" title can be seen in the trailer available in the link section.
The Dynamite Trio (1982).
Added the aliases to who I thought matched... I don't know who they are referring to by Jacky Chek. If it's Jacky Chen, I didn't see him in the film

Added 1 writer and 1 alias.