Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
thuong va » truong va, thong va, thuong mai
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
toan ban » van ban
va toan » van toan, bai toan, tap toan

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 (chiet tach)) - hanh tranh ((cua dung) OR (qua dung)) thuong va toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh tranh ((cua dung) OR (qua dung)) thuong va toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chiet tach)) - hanh tranh ((cua dung) OR (qua dung)) thuong va toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh tranh ((cua dung) OR (qua dung)) thuong va toan ban*.