Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
cua dung » cua dang, cua dong, qua dung
san toan » van toan, dan toan, 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: doi ((chieu sach) or (chiet tach)) - hanh trinh cua dung cong ((san toan) OR (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - hanh trinh cua dung cong ((san toan) OR (manh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (chiet tach)) - hanh trinh cua dung cong ((san toan) OR (manh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chiet tach)) - hanh trinh cua dung cong ((san toan) OR (manh toan)) cao*.