Perhaps you should try some spelling variations:
chien thuong » chien chong, khen thuong, chan thuong
nhiem thuong » nhiem trong, nhiem trung, nghiem huong
thai nghien » thai nguyen, thi nghiem, phap nghien
thanh thai » thanh hai, thanh tai, nhanh thai
khac trac » khac trai, khach trai, khai thac
cu thanh » cuu thanh, cua thanh, chu thanh
nghien d » nghiem d, nghien o, nghiem de
su khac » vu khac, se khac, bui khac
d hoc » du hoc, ad hoc, de hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su khac trac ((nhiem thuong) OR (chien thuong)) ho ) or ( cu thanh thai nghien d hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su khac trac ((nhiem thuong) OR (chien thuong)) ho ) OR ( cu thanh thai nghien d hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su khac trac ((nhiem thuong) OR (chien thuong)) ho ) or ( cu thanh thai nghien d hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( su khac trac ((nhiem thuong) OR (chien thuong)) ho ) or ( cu thanh thai nghien d hoc ))*.