Perhaps you should try some spelling variations:
dong zhang » dong sheng, dong yang, kong hang
dong hoang » hong hong
yang mind » yang cindy, yang jin, sang minh
than bau » than bad, than a, than you
can data » can tata, dan data, fan data
mind how » aid how
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 zhang) OR (dong hoang)) fan ((than bau) OR (can data)) yang mind how hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong zhang) OR (dong hoang)) fan ((than bau) or (can data)) yang mind how hai ;~".
• Adding a wildcard symbol may retrieve word variants: ((dong zhang) OR (dong hoang)) fan ((than bau) or (can data)) yang mind how hai ;*.