These books are remarkably entertaining and either non-existent, very hard to find, or very expensive in English translation. Those by Louis Cha are considered classics of Chinese literature. They are full of fighting action worthy of a John Woo film, secret societies, Robin Hood like antics, and funky Kung Foo styles and super powers. A lot of the action takes place in The Back of Beyond, which was clearly considered the wild west in historical China.
You kind find many of them for free at this Wuxiasociety translation page either as web pages or in mobi (kindle) or ePub (e-reader) format.(You can email the files to your kindle email address to open them.)
This page also serves as a handy reference to just about everything available in English be it digital or print.
http://wuxiasociety.com/translations/Note that some of these are links to Amazon where you can buy the only available translations. Of course I haven't read all of these, and I did notice that the downloadable version of The Book and Thee Sword was excerpts from the novel, which makes sense as its copyright protected. The external translations should be complete unless noted otherwise. Enjoy!