Perhaps you should try some spelling variations:
cheng zhang » cheng han, zhen zhang, china zhang
wang yidan » wang yan
yidan kang » yuan kang
chen zheng » chen zhen, chen aizheng, chen zhe
kang chen » chang chen, jane chen, kang han
sing kong » king kong, hong kong
kong ghi » hong ghi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yidan kang chen ((cheng zhang) or (chen zheng)) sing kong ghi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yidan kang chen ((cheng zhang) OR (chen zheng)) sing kong ghi ;.
• Adding a wildcard symbol may retrieve word variants: wang yidan kang chen ((cheng zhang) or (chen zheng)) sing kong ghi ;*.