Perhaps you should try some spelling variations:
dong hoang » hong hong
hoang fan » zhang fan, yang fan
yang mind » yang cindy, yang jin, sang minh
than bau » than bad, than a, than you
can data » can tata, dan data, fan data
how aid » how asia
how ai » how ae, how am, how asia

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: dong hoang fan ((than bau) OR (can data)) yang mind ((how ai) OR (how aid)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong hoang fan ((than bau) or (can data)) yang mind ((how ai) OR (how aid)) ;~".
• Adding a wildcard symbol may retrieve word variants: dong hoang fan ((than bau) or (can data)) yang mind ((how ai) OR (how aid)) ;*.