Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
nhung don » nhung van, nhung bo
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
trang va » tran van, hang va
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: ho chieu sach - hanh trang va ((nhung don) or (dung cong)) ((tac toan) OR (tam toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh trang va ((nhung don) OR (dung cong)) ((tac toan) OR (tam toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh trang va ((nhung don) or (dung cong)) ((tac toan) OR (tam toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh trang va ((nhung don) or (dung cong)) ((tac toan) OR (tam toan)) cau*.