Perhaps you should try some spelling variations:
chang boon » chang soon, cheng boon, chang won
chen chang » chen chung, chin chang, shen chang
boon chong » boon siong, joon chang
chong seo » hong seo, chong en, chong suk
gang yao » yang yao, wang yan, ganga ya
ying yu » ming yu, ying zhu, yang yue
ping yu » ming yu, ping ku, ping yi

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

• Performing a fuzzy search may retrieve terms with similar spellings: gang yao ((ying yu) or (ping yu)) chen chang boon chong seo ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: gang yao ((ying yu) OR (ping yu)) chen chang boon chong seo ;.
• Adding a wildcard symbol may retrieve word variants: gang yao ((ying yu) or (ping yu)) chen chang boon chong seo ;*.