Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » thong cong, hang cong, nhung don
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
dan toan » van toan, dan than, manh toan
van tan » van tuan, van ban, van tai

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 trung cua ((nhung cong) OR (dung cong)) ((dan toan) or (van tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh trung cua ((nhung cong) OR (dung cong)) ((dan toan) OR (van tan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh trung cua ((nhung cong) OR (dung cong)) ((dan toan) or (van tan)) cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh trung cua ((nhung cong) OR (dung cong)) ((dan toan) or (van tan)) cao*.