Perhaps you should try some spelling variations:
dung thuong » dung trong, hang thuong, dung thuoc
cong thuong » hang thuong
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
van van » tan van, san van, van vat

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