Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cua trung » cua truong, xuan trung, cua nhung
manh toan » thanh toan, anh tuan, tinh toan
dan toan » van toan, dan than, xuan toan

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

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