Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh chat
chieu sach » chinh sach, chiet tach, chieu sang
trinh thuc » trinh tu, trinh thi
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than tap » toan tap, han tap, phan tap

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

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