Perhaps you should try some spelling variations:
yuan wang » yan wang, yuan kang, yuan chang
yang dali » yang di, bang dai, yang all
210 david » 2005 david, 2009 david, 2017 david
de david » die david, wade david, dawe david
yang li » yang lin, yang di, yang xi
2 david » 2.1 david, 226 david, et david
ian hai » dang hai

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: yuan wang ((yang dali) OR (yang li)) reform ((((2 david) OR (210 david))) OR (de david)) ian hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yuan wang ((yang dali) or (yang li)) reform ((((2 david) OR (210 david))) or (de david)) ian hai ;~".
• Adding a wildcard symbol may retrieve word variants: yuan wang ((yang dali) or (yang li)) reform ((((2 david) OR (210 david))) or (de david)) ian hai ;*.