Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
john song » john wong, john bonn, john ngosong
song sein » song shin, song jin, song min
yang yao » wang yan, yang yi, yang fan
chen kan » chen tan, chen yang, chen jian
kan john » gain john, ryan john, tian john
a chen » ta chen, _ chen, n chen

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: wang ((yang yao) OR (yang yang)) a chen kan john song sein ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yang yao) or (yang yang)) a chen kan john song sein ;*.