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