Perhaps you should try some spelling variations:
dong hoang » hong hong
hoang fan » zhang fan, yang fan
than daun » than bau, than daem, than days
than data » than death, loan data, can data
yang john » young john, king john, yang jun
yang jin » yang jie, yang jun, ying jin
how ai » how aid, how ae, how am

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