Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
canh trang » hanh trang, banh trang, thanh trang
cong thanh » dong thanh, cong trinh, truong thanh
so thiet » soc thiet, hoc thiet, hoa thiet
cong tan » cong tac, cong san, cong ty
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: so thiet tach - ((canh trang) or (canh tranh)) va tong ((cong tan) or (cong thanh)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - ((canh trang) OR (canh tranh)) va tong ((cong tan) OR (cong thanh)) phan tu.
• Adding a wildcard symbol may retrieve word variants: so thiet tach - ((canh trang) or (canh tranh)) va tong ((cong tan) or (cong thanh)) phan tu*.