Perhaps you should try some spelling variations:
ryana does » ghana does
dong yang » dong hoang, wang yang, yang yang
tax bases » tax base
debt law » debt how
bases yu » bases sur, bases _, bases de
debt a » debt _
yang » ryang
yan » ryan
ryana » rryana

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) OR (wang yan)) ryana does ((debt law) OR (debt a)) tax bases yu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong yang) or (wang yan)) ryana does ((debt law) OR (debt a)) tax bases yu ;~".
• Adding a wildcard symbol may retrieve word variants: ((dong yang) or (wang yan)) ryana does ((debt law) OR (debt a)) tax bases yu ;*.