Perhaps you should try some spelling variations:
wang kang » wang yang, wang liang, wang yan
kang chen » chang chen, jane chen, kang han
john song » john wong, john bonn, john ngosong
tan ying » fan ying, ran ying, tan yong
tan yang » dan yang, tan yong, tao yang
jin kang » jin chang, jin kyung, jing fang
chen yu » chen y, chen yulu, cheng lu

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 kang chen yu ((tan ying) OR (tan yang)) ((jin kang) OR (john song)) yam ;~.
• Adding a wildcard symbol may retrieve word variants: wang kang chen yu ((tan ying) or (tan yang)) ((jin kang) or (john song)) yam ;*.