Perhaps you should try some spelling variations:
luan thuong » lan thuong, luan phuong, luan tuong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
luong ban » luong van, luong bac, luong san
anh dung » anh dong, anh huong, sach dung
ban than » ban thanh, van thanh, ban hang
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu tinh) or (trieu tinh)) - anh dung ((luan thuong) OR (luat thuong)) luong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (trieu tinh)) - anh dung ((luan thuong) OR (luat thuong)) luong ban than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu tinh) or (trieu tinh)) - anh dung ((luan thuong) OR (luat thuong)) luong ban than cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) or (trieu tinh)) - anh dung ((luan thuong) OR (luat thuong)) luong ban than cau*.