Perhaps you should try some spelling variations:
dong hoang » hong hong
hoang fan » zhang fan, yang fan
yang mind » yang cindy, yang jin, tang min
sang minh » kang minah, anh minh, song min
than bau » than bad, than a, than you
can data » can tata, dan data, fan data
how hai » how has, how ai, how hci

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