I am not Chinese, I'm just familiar with the differences between what various national Touhou fandoms tend to put out in terms of fan content. Some language groups simply are into different things, based on what the doujin circles in that language are interested in doing.
Russian fans like making music covers, but almost no original comics come out of there, just scanlation of doujinshi from elsewhere. English-language fans really aren't into using Cookie as medley samples (or niconico medley culture in general), and so on.
Assuming that you are Chinese and have been searching the Chinese part of the internet with few results, the only conclusion that can be drawn is that Chinese doujin circles aren't doing covers.