Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
van tan » van tuan, van ban, van tai
tan ban » toan ban, tang ban, van ban

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 (hieu lang)) - canh tranh cua ((hang cong) OR (hang nong)) van tan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (hieu lang)) - canh tranh cua ((hang cong) OR (hang nong)) van tan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (hieu lang)) - canh tranh cua ((hang cong) OR (hang nong)) van tan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu lang)) - canh tranh cua ((hang cong) OR (hang nong)) van tan ban*.