Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
yuan kang » yuan wang, yuan chang, chan kang
kang yong » kang young, wang yong, kong young
yang yan » wang yan, yang fan, yang yao
yong cai » dong cao, yong c, yong wah
eang hay » kang han
hai » hadi, haji, hari

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 ((yang yan) OR (yang yang)) yuan kang yong cai ((eang hay) OR (dang hai)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang yan) OR (yang yang)) yuan kang yong cai ((eang hay) or (dang hai)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yang yan) OR (yang yang)) yuan kang yong cai ((eang hay) or (dang hai)) ;*.