Perhaps you should try some spelling variations:
sang minh » kang minah, anh minh, song min
yang fan » zhang fan, yang dean, yang yang
than bad » than bau, than a, than big
can data » can tata, dan data, fan data
minh how » mind how, minh hoa, myth how
yang ka » yang yao
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 ka) OR (yang fan)) ((than bad) OR (can data)) sang minh how hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong ((yang ka) OR (yang fan)) ((than bad) or (can data)) sang minh how hai ;~".
• Adding a wildcard symbol may retrieve word variants: dong ((yang ka) OR (yang fan)) ((than bad) or (can data)) sang minh how hai ;*.