Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
than daem » than data, than days, than deep
can data » can tata, dan data, fan data
yang jin » yang jie, yang jun, ying jin
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 yang ((than daem) OR (can data)) yang jin ((how hai) OR (how has)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong yang yang ((than daem) or (can data)) yang jin ((how hai) OR (how has)) ;~".
• Adding a wildcard symbol may retrieve word variants: dong yang yang ((than daem) or (can data)) yang jin ((how hai) OR (how has)) ;*.