Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, yang yang
yang mind » yang cindy, sang minh, tang min
than bau » than bad, than a, than you
can tata » can data, can take, can tax
yang jin » yang jie, yang jun, ying jin
yang ka » yang fan, 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 ((than bau) OR (can tata)) ((yang mind) OR (yang jin)) how hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong yang ka ((than bau) or (can tata)) ((yang mind) OR (yang jin)) how hai ;~".
• Adding a wildcard symbol may retrieve word variants: dong yang ka ((than bau) or (can tata)) ((yang mind) OR (yang jin)) how hai ;*.