Perhaps you should try some spelling variations:
john ngosong » john song
chen shuang » chen chuan, chen chung, chen huigang
dong hoang » hong hong
chen wang » chen rong, chen ping
chen yang » chen rong
hoang li » huang lin, hoang vu, hoang sy
li hua » li hui, lu hua

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong hoang li hua ((((chen wang) or (chen shuang))) or (chen yang)) john ngosong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong hoang li hua ((((chen wang) OR (chen shuang))) OR (chen yang)) john ngosong yu ;.
• Adding a wildcard symbol may retrieve word variants: dong hoang li hua ((((chen wang) or (chen shuang))) or (chen yang)) john ngosong yu ;*.