Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tac » cong ty
tac ran » tac can, tac van, tac quan
ran cau » van cau, ban cau, can cau

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

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