Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tien thanh » tien thinh, tran thanh, den thanh
hanh trinh » canh tranh, hanh chinh
trinh han » trinh quan
hang cong » dang cong, hang nong, bang cong
han hang » hang hang, han chang, ban hang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (tien thanh)) - hanh trinh han hang cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (tien thanh)) - hanh trinh han hang cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (tien thanh)) - hanh trinh han hang cong dan than cau*.