Perhaps you should try some spelling variations:
test sang » test salt, test sat
sang minh » kang minah, anh minh, song min
dong nan » dong yang, dong sin, dong cao
dong bin » dong sin, dong di, dann bin
hua test » a test
hong ghi » zhong zhi, hong g
hong hai » shang hai, zhong tai, dang hai

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

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