Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
ho chieu » theo chieu, hoc thieu, doi chieu
van toan » van tuan, van tan, van thanh

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