Perhaps you should try some spelling variations:
yuan cheng » yuan chang, huang cheng, yu cheng
cheng than » cheng han, cheng zhang, cheng guan
than china » tuan china, han china, wuhan china
china rene » china ren, china rate, china real
yang xin » yang jin, yang lin, zhang xin
yang yun » yang jun, tang yun, yang yue
wong yue » wang yue, hong yu
yang xi » yang di, yang yi, yang jui

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: yuan cheng than china rene ((((yang xin) or (yang yun))) or (yang xi)) wong yue ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yuan cheng than china rene ((((yang xin) OR (yang yun))) OR (yang xi)) wong yue ;.
• Adding a wildcard symbol may retrieve word variants: yuan cheng than china rene ((((yang xin) or (yang yun))) or (yang xi)) wong yue ;*.