Perhaps you should try some spelling variations:
test sang » test salt, test sat
sang minh » kang minah, anh minh, song min
dong cao » dong xiao, dan cao, dong nan
dong bin » dong sin, dong di, dann bin
cong ghi » cong shu
hong ghi » zhong zhi, hong g, hong hai
ya a » a a, y a, ye a

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong cao) or (dong bin)) ya a test sang minh ((cong ghi) OR (hong ghi)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong cao) OR (dong bin)) ya a test sang minh ((cong ghi) OR (hong ghi)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong cao) or (dong bin)) ya a test sang minh ((cong ghi) OR (hong ghi)) ;".
• Adding a wildcard symbol may retrieve word variants: ((dong cao) or (dong bin)) ya a test sang minh ((cong ghi) OR (hong ghi)) ;*.