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
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
dan than » dan chan, ban than, van than
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) OR (dung cong)) dan 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) OR (dung cong)) dan 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) OR (dung cong)) dan than tap".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trinh thuat) or (trinh thuc)) ((nhung cong) OR (dung cong)) dan than tap*.