Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh chat
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trinh thuc » trinh tu, trinh thi
nhung cong » dung cong, thong cong, hang cong
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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 sach - hanh ((trinh thuat) or (trinh thuc)) nhung cong ((dan than) OR (ban than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((trinh thuat) OR (trinh thuc)) nhung cong ((dan than) OR (ban than)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh ((trinh thuat) or (trinh thuc)) nhung cong ((dan than) OR (ban than)) tap".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((trinh thuat) or (trinh thuc)) nhung cong ((dan than) OR (ban than)) tap*.