Everything I 'know' about Asian culture comes from either an unholy attraction to their young women, a healthy appetite for Anime, the Oriental Adventures book from 1st edition AD&D, or Google. In that order.
I know that there is a school of thought with 5 elements, and it breaks down the classic greek 'earth' into Wood and Metal. I think. Sort of. That's the more Asian take anyway.
Oddly, WuJen is kind of shoehorned into using Spirit, as Heremetics are more of a Western idea. I took it as being more spiritual and went with Ancestors, and assume when I call Earth I'm getting either wood or metal, but I'm not a real life philosopher. Maybe eventually I'll take Spirit Expansion: UMT (Plant), and fill out the roster. In the mean time I can reflect it by learning the Calling ritual, which lets me summon anything, just not on the fly the way I can Elementals and Man.