Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, yang yang
yang minh » yang mind, kang minah, anh minh
sang minh » kang minah, anh minh, song min
long shu » cong shu, tong shui, long du
wong sam » wong sau, wong lai, kong sar
yang xi » yang di, yang yi, yang jui
xi a » xi ai, i a, ii a
test » text, west, best

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: dong yang xi a test ((yang minh) or (sang minh)) ((long shu) or (wong sam)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong yang xi a test ((yang minh) OR (sang minh)) ((long shu) OR (wong sam)) ;.
• Adding a wildcard symbol may retrieve word variants: dong yang xi a test ((yang minh) or (sang minh)) ((long shu) or (wong sam)) ;*.