Perhaps you should try some spelling variations:
wang yuhan » wang luhang, wang yan, wang yidan
yuhan kang » yuan kang, chan kang, yuhuan huang
ahsan syed » khan syed
khan sher » han shen, khan syed, than she
chan fung » chan fong, can fund, chan eng
fung chen » yung chen, fung chung, kang chen
chen zhi » chen zhe, chen zhen, chen chih

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yuhan kang ((khan sher) or (ahsan syed)) chan fung chen zhi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yuhan kang ((khan sher) OR (ahsan syed)) chan fung chen zhi ;.
• Adding a wildcard symbol may retrieve word variants: wang yuhan kang ((khan sher) or (ahsan syed)) chan fung chen zhi ;*.