Perhaps you should try some spelling variations:
chiet tach » chieu sach
canh trang » hanh trang, banh trang, thanh trang
cong thanh » dong thanh, cong trinh, truong thanh
doi chiet » doi chieu, doi chi, doi viet
va thong » va thuong, va phuong, he thong
cong tan » cong tac, cong san, cong ty
toan tap » toan ban

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

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