Perhaps you should try some spelling variations:
yuan wang » yan wang, yuan kang, yuan chang
wang zhen » wang zheng, fang zhen, wang zhenpo
zhen yong » chen yong, zheng rong, zheng cong
yong john » young john, kong john, wong john
john song » john wong, john bonn, john ngosong
yan yuan » yan guan, fang yuan, nan yan

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: ((wan OR wing) OR lang) yan yuan wang zhen yong john song (shin OR sein) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wan or wing) or lang) yan yuan wang zhen yong john song (shin OR sein) ;~".
• Adding a wildcard symbol may retrieve word variants: ((wan or wing) or lang) yan yuan wang zhen yong john song (shin OR sein) ;*.