Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hanh luan » khanh luan, hang luan, hanh luat
van nhung » van nhuong, va nhung, van hung
tich toan » tinh toan, tich than, trinh toan
tac toan » tam toan, hach toan, tac thanh
tap toan » tap doan, tap quan, bai toan

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

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