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

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