Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, yang yang
than daun » than bau, than daem, than data
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 ai, how hci, how have
how has » how have

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 daun) OR (can tata)) yang jin ((how hai) OR (how has)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong yang ka ((than daun) or (can tata)) yang jin ((how hai) OR (how has)) ;~".
• Adding a wildcard symbol may retrieve word variants: dong yang ka ((than daun) or (can tata)) yang jin ((how hai) OR (how has)) ;*.