Perhaps you should try some spelling variations:
nhung duong » nhung dung, nhung huong, nhung tuong
luan nhung » luan chung, luan hung, quan nhung
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tang luan » dung luan
van thanh » van tuan
ban thanh » ban hanh, ban hang
anh tang » anh bang, anh dang, anh nang
toan » tran

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) or (toan tien)) tach - anh tang luan nhung duong ((van thanh) OR (ban thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (toan tien)) tach - anh tang luan nhung duong ((van thanh) OR (ban thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) or (toan tien)) tach - anh tang luan nhung duong ((van thanh) OR (ban thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (toan tien)) tach - anh tang luan nhung duong ((van thanh) OR (ban thanh)) cau*.