Perhaps you should try some spelling variations:
dung thuong » dung trong, cong thuong, dung thuoc
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chiet » hoc thiet, hoc hien, hoc viet
hoc nhiet » hoc thiet, hoc nghien, hoc hien
tranh cua » doanh cua, manh cua
van thanh » ban thanh, van tuan
thanh ban » thanh san, thanh van, thanh bac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chiet) or (hoc nhiet)) tach - hanh tranh cua ((dung thuong) OR (hang thuong)) van thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chiet) OR (hoc nhiet)) tach - hanh tranh cua ((dung thuong) OR (hang thuong)) van thanh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) or (hoc nhiet)) tach - hanh tranh cua ((dung thuong) OR (hang thuong)) van thanh ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) or (hoc nhiet)) tach - hanh tranh cua ((dung thuong) OR (hang thuong)) van thanh ban*.