Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
yang mind » yang cindy, yang jin, tang min
sang minh » kang minah, anh minh, song min
yang fan » zhang fan, yang dean, yang jin
than bau » than bad, than a, than you
can data » can tata, dan data, fan data
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: yang yang fan ((than bau) OR (can data)) ((yang mind) OR (sang minh)) how has ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang fan ((than bau) or (can data)) ((yang mind) OR (sang minh)) how has ;~".
• Adding a wildcard symbol may retrieve word variants: yang yang fan ((than bau) or (can data)) ((yang mind) OR (sang minh)) how has ;*.