Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » hanh chinh
ho chieu » theo chieu, hoc thieu, doi chieu
quan han » quan hanh, quanh han, quan ha
tong dan » tuong dan, thong dan, trong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 trinh) OR (canh tranh)) quan han tong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - ((hanh trinh) OR (canh tranh)) quan han tong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - ((hanh trinh) OR (canh tranh)) quan han tong dan toan cau*.