Perhaps you should try some spelling variations:
dong hoang » hong hong
young john » kong john, wong john, young jean
hoang yao » yang yao, gang yao
than daun » than bau, than daem, than data
can data » can tata, dan data, fan data
john how » john hope, john holt, john hook
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 yao ((than daun) OR (can data)) young john how hai ;~.
• Adding a wildcard symbol may retrieve word variants: dong hoang yao ((than daun) or (can data)) young john how hai ;*.