Perhaps you should try some spelling variations:
cheng yang » chen yang, cheng zhang, chen wang
yang john » young john, king john, yang jin
john wong » john song, john bonn
lang yan » wang yan, wang yang, zhang yan
yang yue » wang yue, yang yun, yang jui
wong sau » wong sam, wong siu, wong shiu
yang yu » yang yun, yang yi, sang yu

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

• Performing a fuzzy search may retrieve terms with similar spellings: lang yan ((yang yu) or (yang yue)) cheng yang john wong sau ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang yan ((yang yu) OR (yang yue)) cheng yang john wong sau ;.
• Adding a wildcard symbol may retrieve word variants: lang yan ((yang yu) or (yang yue)) cheng yang john wong sau ;*.