Perhaps you should try some spelling variations:
yuan chang » yuan cheng, huang chang, han chang
kang young » wang hyoung
chang you » change you, change your, thing you
chen yang » chen rong
yan yuan » yan guan, fang yuan, nan yan
you chen » you when, you chenli, you check
yang lin » yang jin, wang lin, yang li

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: yan yuan chang you chen yang lin ((dong sin) OR (kang young)) ;~.
• Adding a wildcard symbol may retrieve word variants: yan yuan chang you chen yang lin ((dong sin) or (kang young)) ;*.