Perhaps you should try some spelling variations:
dong hoang » hong hong
than data » than death, loan data, dan data
hoang ka » hoang vu, hoang sy, hoang _
can data » can tata, dan data, fan data
yang jin » yang jie, yang jun, shang jin
ying jin » jing ji, yang jie
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 hoang ka ((than data) OR (can data)) ((yang jin) OR (ying jin)) how has ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong hoang ka ((than data) or (can data)) ((yang jin) OR (ying jin)) how has ;~".
• Adding a wildcard symbol may retrieve word variants: dong hoang ka ((than data) or (can data)) ((yang jin) OR (ying jin)) how has ;*.