Perhaps you should try some spelling variations:
yan zhang » yuan chang, bin zhang, han chang
chang han » chang ha, cheng han, zhang han
hyoung il » hong il
wing tan » wing ian, liang tan, hong tan
kyung il » kyung min
tan tan » tas tan, tin tan, tang tang
yan han » man han, kang han, yan clan

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 tan tan ((yan han) OR (yan zhang)) chang han ((kyung il) OR (hyoung il)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wing tan tan ((yan han) OR (yan zhang)) chang han ((kyung il) or (hyoung il)) ;~".
• Adding a wildcard symbol may retrieve word variants: wing tan tan ((yan han) OR (yan zhang)) chang han ((kyung il) or (hyoung il)) ;*.