Perhaps you should try some spelling variations:
liang sun » liang dan, liang tan, wing sun
song ming » song bing, song min, gong min
jeong shu » jeong su
wing yan » wang yan, wing ian, wing tan
kim song » kim young, kim eung
yang du » yang di, yang d, yang mu
yang xi » yang di, yang yi, yang jui

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: ((wing yan) OR (liang sun)) ((yang du) OR (yang xi)) kim song ming ((jeong shu) OR (cong shu)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wing yan) or (liang sun)) ((yang du) or (yang xi)) kim song ming ((jeong shu) OR (cong shu)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((wing yan) or (liang sun)) ((yang du) or (yang xi)) kim song ming ((jeong shu) OR (cong shu)) ;*.