Perhaps you should try some spelling variations:
chuyen hang » chuyen thanh, chuyen dong, chuyen dung
chieu sach » chinh sach, chiet tach, chieu sang
tien thanh » tien thinh, tran thanh, den thanh
hanh trinh » canh tranh, hanh chinh
chuan hang » chuan trang, cua hang, chuan ha
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 ((chuan hang) OR (chuyen 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 ((chuan hang) OR (chuyen hang)) cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (tien thanh)) - hanh trinh ((chuan hang) OR (chuyen hang)) cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (tien thanh)) - hanh trinh ((chuan hang) OR (chuyen hang)) cong dan than cau*.