Perhaps you should try some spelling variations:
cheng zhang » cheng han, zhen zhang, chen zheng
zhang sing » zhang ming, zhang jing, zhang ping
sing dong » sing kong, jeng dong, shin dong
yuan hui » jaan hui, tuan hua, yang hui
wan yan » wang yan, nan yan, wai yan
sing » signg, sindg, sking
sin » sign, sind, skin

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

• Performing a fuzzy search may retrieve terms with similar spellings: wan yan ((yuan hui) or (yuan fei)) cheng zhang sing dong sin ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan yan ((yuan hui) OR (yuan fei)) cheng zhang sing dong sin ;*.