Perhaps you should try some spelling variations:
zhang yan » zhang fan, zhang jian, wang yan
yulu chen » yu chen
dong sind » dong bin, dong ping
yu cheng » yu chen, _ cheng
chan eng » chan fong, chan kang, chan ming
yan yao » yang yao, gang yao, yan yuan
sind » signd, skind, seind
sin » sign, skin, sein

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

• If you are trying to use Boolean operators, they must be ALL CAPS: zhang yan yao ((yulu chen) OR (yu cheng)) chan eng ((dong sind) OR (dong sin)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "zhang yan yao ((yulu chen) or (yu cheng)) chan eng ((dong sind) OR (dong sin)) ;~".
• Adding a wildcard symbol may retrieve word variants: zhang yan yao ((yulu chen) or (yu cheng)) chan eng ((dong sind) OR (dong sin)) ;*.