Perhaps you should try some spelling variations:
canh trang » hanh trang, banh trang, thanh trang
dung cong » dung trong
chi sach » chinh sach, chieu sach, moi sach
cong san » cong tac
san phan » san pham, van phan, sat phan
co sach » bo sach, cuon sach, hoc sach
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chi sach) OR (co sach)) - ((canh trang) or (canh tranh)) va dung cong san phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi sach) OR (co sach)) - ((canh trang) OR (canh tranh)) va dung cong san phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi sach) OR (co sach)) - ((canh trang) or (canh tranh)) va dung cong san phan tu".
• Adding a wildcard symbol may retrieve word variants: doi ((chi sach) OR (co sach)) - ((canh trang) or (canh tranh)) va dung cong san phan tu*.