Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, yang yang
yang city » nang city, yang cindy, nanyang city
yang yao » yang yang, wang yan, yang yi
than bau » than bad, than a, than you
can data » can tata, fan data, chain data
dan data » dan dana, dn data, fan data
how hai » how has, how ai, how hci

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 yao ((than bau) OR (((can data) OR (dan data)))) yang city how hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong yang yao ((than bau) or (((can data) OR (dan data)))) yang city how hai ;~".
• Adding a wildcard symbol may retrieve word variants: dong yang yao ((than bau) or (((can data) OR (dan data)))) yang city how hai ;*.