Perhaps you should try some spelling variations:
yang agenda » yang anda, change agenda
dong yang » dong hoang, wang yang, yang yang
than daem » than days, than deep, thanh dam
than data » than death, loan data, can data
yang ka » yang fan, yang yao
how ai » how aid, how am, how asia
how ae » how age, how am, how case

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 daem) OR (than data)) yang agenda ((how ai) OR (how ae)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong yang ka ((than daem) or (than data)) yang agenda ((how ai) OR (how ae)) ;~".
• Adding a wildcard symbol may retrieve word variants: dong yang ka ((than daem) or (than data)) yang agenda ((how ai) OR (how ae)) ;*.