Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, yang yang
sang minh » kang minah, anh minh, song min
yang yao » yang yang, wang yan, yang yi
hua rene » hua ren, juan rene
yang lin » yang jin, wang lin, yang li
yao hua » ya hua
hong yu » wong yue

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong yang yao hua rene ((yang lin) or (sang minh)) hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong yang yao hua rene ((yang lin) OR (sang minh)) hong yu ;.
• Adding a wildcard symbol may retrieve word variants: dong yang yao hua rene ((yang lin) or (sang minh)) hong yu ;*.