Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, hanh trinh, minh trang
hoc chieu » hoc thieu, ho chieu, hoc hien
cua khong » cua phuong, cua thuong, cua cong
hua khong » hoa khong, hoac khong, phuc khong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sach - ((hanh trang) or (canh tranh)) ((cua khong) OR (hua khong)) cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - ((hanh trang) OR (canh tranh)) ((cua khong) OR (hua khong)) cong san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - ((hanh trang) or (canh tranh)) ((cua khong) OR (hua khong)) cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - ((hanh trang) or (canh tranh)) ((cua khong) OR (hua khong)) cong san toan ban*.