Perhaps you should try some spelling variations:
cheng zhang » cheng han, zhen zhang, chen zheng
yuhan wang » yuhuan huang
yuan wang » yuan kang, yuan chang, qian wang
tan cheng » tang zheng, yuan cheng, tan hong
zhang xin » zhang jian, zhang ming, zhang fan
yan wang » yang yang, qian wang, yan liang
tong sun » cong sun, tong shui, tong song

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 wang) or (yan wang))) or (yuan wang)) tan cheng zhang xin tong sun ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((((yuhan wang) OR (yan wang))) OR (yuan wang)) tan cheng zhang xin tong sun ;.
• Adding a wildcard symbol may retrieve word variants: wang ((((yuhan wang) or (yan wang))) or (yuan wang)) tan cheng zhang xin tong sun ;*.