Perhaps you should try some spelling variations:
wang shiyong » wang hyoung
cheng zhang » cheng han, zhen zhang, chen zheng
wang wang » wang yang, wang liang, wang yan
fang yuan » wang yuhan, wang yan, meng yuan
wang yong » wang yang, wang hyoung, wang yan
yan yuan » yan guan, nan yan, yan clan
ago » agro

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 wang ((yan yuan) OR (fang yuan)) cheng zhang ((wang yong) OR (wang shiyong)) ago ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang ((yan yuan) OR (fang yuan)) cheng zhang ((wang yong) or (wang shiyong)) ago ;~".
• Adding a wildcard symbol may retrieve word variants: wang wang ((yan yuan) OR (fang yuan)) cheng zhang ((wang yong) or (wang shiyong)) ago ;*.