Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
luan trong » quan trong, luat trong, luan tuong
thien anh » thien danh, tien anh, thien chanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

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