Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, yang yang
sang minh » kang minah, anh minh, song min
yang yao » yang yang, wang yan, yang yi
than big » than bling, can big, mean big
can data » can tata, dan data, fan data
minh how » mind how, minh hoa, myth 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 yang yao ((than big) OR (can data)) sang minh how hai ;~.
• Adding a wildcard symbol may retrieve word variants: dong yang yao ((than big) or (can data)) sang minh how hai ;*.