Perhaps you should try some spelling variations:
dung cong » dung trong
tien anh » tien manh, dien anh, tien thanh
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong san, cong thanh
va dung » van dung, va duong, vat dung
can cau » van cau, ban cau, cac cau
ca cau » cua cau, cac cau, ca cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien anh) or (tieng anh)) - canh tranh va dung cong tan ((can cau) OR (ca cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien anh) OR (tieng anh)) - canh tranh va dung cong tan ((can cau) OR (ca cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien anh) or (tieng anh)) - canh tranh va dung cong tan ((can cau) OR (ca cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien anh) or (tieng anh)) - canh tranh va dung cong tan ((can cau) OR (ca cau))*.