Perhaps you should try some spelling variations:
thuong quan » thuong quang, thong quan, truong quan
ton thuong » thong thuong, cong thuong, hoc thuong
hieu soat » hieu suat, hieu hoat, hieu luat
luan bien » luan lien, luong bien, luan tieu
xuan bien » xuan dien, xuan kien, xuan vien
van hieu » cao hieu
tin » tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung luan van hieu soat ) or ( ton thuong quan ((luan bien) OR (xuan bien)) soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van hieu soat ) OR ( ton thuong quan ((luan bien) OR (xuan bien)) soan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung luan van hieu soat ) or ( ton thuong quan ((luan bien) OR (xuan bien)) soan ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van hieu soat ) or ( ton thuong quan ((luan bien) OR (xuan bien)) soan ))*.