Perhaps you should try some spelling variations:
cheng guan » cheng han, thong guan
cheng than » cheng han, cheng zhang, changes than
wei yang » pei yang, wei wang, wei yang's
yang hui » wang hui, yang muxi, zhang hui
yang jui » yang judy, yang di, yang xi
wai yan » wang yan
dong » doing, long, done
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: ((wai yan) or (wei yang)) ((yang hui) or (yang jui)) ong ((cheng than) OR (cheng guan)) dong sin ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wai yan) OR (wei yang)) ((yang hui) OR (yang jui)) ong ((cheng than) OR (cheng guan)) dong sin ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wai yan) or (wei yang)) ((yang hui) or (yang jui)) ong ((cheng than) OR (cheng guan)) dong sin ;*".