Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » hanh chinh
quan nhung » qua nhung, cua nhung, luan chung
cong tanh » cong thanh, cong tinh, cong danh
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong thanh
tuan cau » toan cau, quan cau, tuan cu

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