Perhaps you should try some spelling variations:
than china » tuan china, han china, wuhan china
china john » china joins, child john, china jean
yang yang » wang yang, wang yan
tan yang » dan yang, tan ying, tan yong
hua than » hua ban, hua chen, hua zhao
wong yue » hong yu
wang yue » wang hua, wang yan, wang he

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: lang ((tan yang) OR (yang yang)) hua than china john ((wong yue) OR (wang yue)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang ((tan yang) or (yang yang)) hua than china john ((wong yue) OR (wang yue)) ;~".
• Adding a wildcard symbol may retrieve word variants: lang ((tan yang) or (yang yang)) hua than china john ((wong yue) OR (wang yue)) ;*.