Perhaps you should try some spelling variations:
wang yuhan » wang luhang, wang yan, wang yidan
yang ping » yang jing, yang liang, yang using
ping wang » ping pong, hong wang
yuhan tan » wuhan can
kang chen » chang chen, jane chen, tang chun
tan yang » dan yang, tan ying, tan yong
kang han » kong hang, zhang han, dang hai

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: yang ping wang yuhan tan yang di ((kang tae) OR (((kang han) OR (kang chen)))) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang ping wang yuhan tan yang di ((kang tae) or (((kang han) OR (kang chen)))) ;~".
• Adding a wildcard symbol may retrieve word variants: yang ping wang yuhan tan yang di ((kang tae) or (((kang han) OR (kang chen)))) ;*.