Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, yang yang
than daun » than bau, than daem, than data
sang minh » kang minah, anh minh, song min
yang fan » zhang fan, yang dean, yang yang
fan data » can data, dan data, loan data
minh how » mind how, minh hoa, myth how
how aid » 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 yang fan ((than daun) OR (fan data)) sang minh how aid ;~.
• Adding a wildcard symbol may retrieve word variants: dong yang fan ((than daun) or (fan data)) sang minh how aid ;*.