Perhaps you should try some spelling variations:
wang zheng » wang zhenpo, fang sheng, fang zhen
tang zheng » fang sheng, fang zhen, tan cheng
wang sang » wang yang, wang liang, wang yan
sang minh » kang minah, anh minh, song min
yuan yi » yuan zi, yuan fei, yuan hui
yuan li » yuan lin, guan li, yuan zi
yang xi » yang di, yang yi, yang jui

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

• If you are trying to use Boolean operators, they must be ALL CAPS: wang sang minh ((yuan yi) OR (yuan li)) yang xi ((wang zheng) OR (tang zheng)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang sang minh ((yuan yi) or (yuan li)) yang xi ((wang zheng) or (tang zheng)) ;*.