Perhaps you should try some spelling variations:
yuan wang » yan wang, yuan kang, yuan chang
china dan » china den, china data, china des
wang can » wang yan, wang ban, wang dan
dan yang » daun yang, tan yang, wang yang
dr congo » du congo, _ congo, 3 congo
dr kongo » das kongo, dia kongo, dr ong
di wong » dr wong, kie wong

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 can china dan yang ((di wong) OR (((dr congo) OR (dr kongo)))) yue ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yuan wang can china dan yang ((di wong) or (((dr congo) OR (dr kongo)))) yue ;~".
• Adding a wildcard symbol may retrieve word variants: yuan wang can china dan yang ((di wong) or (((dr congo) OR (dr kongo)))) yue ;*.