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