Perhaps you should try some spelling variations:
yuan cheng » yuan chang, huang cheng, yu cheng
tuan china » wuhan china, can china, taiwan china
yuan wang » yan wang, yuan kang, yuan chang
china ren » china loren, china real, china reza
ren yang » ren yan, chen yang, dan yang
wong yue » wang yue, hong yu
yang dr » yang di, yang d, yang du
dr wong » dr ong, dr congo, dr kongo

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((yuan wang) or (yuan cheng)) tuan china ren yang dr wong yue ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yuan wang) OR (yuan cheng)) tuan china ren yang dr wong yue ;*.