Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh luan » trinh luan, trinh luat, doanh luan
thuong dan » huong dan, thuong dam, thuong lan
thuong han » thuong mai, thuong va, thuong gap
luan dung » lan dung, luan dong, luan hung
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: hoc ((chieu sach) or (chinh sach)) - hanh tranh luan dung ((thuong dan) OR (thuong han)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chinh sach)) - hanh tranh luan dung ((thuong dan) OR (thuong han)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chinh sach)) - hanh tranh luan dung ((thuong dan) OR (thuong han)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chinh sach)) - hanh tranh luan dung ((thuong dan) OR (thuong han)) toan cau*.