Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
canh trang » hanh trang, banh trang, thanh trang
tong cong » trong cong, cong cong, dung cong
cong toan » cong tan, cong hoan, cong tuan
toan phan » thanh phan, toan ban, hoa phan
ho thiet » hoc thiet, hoa thiet, so thiet
phan cau » phan dau, phan cac, phan tu
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: ho thiet tach - ((canh trang) or (canh tranh)) va tong cong toan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - ((canh trang) OR (canh tranh)) va tong cong toan phan cau.
• Adding a wildcard symbol may retrieve word variants: ho thiet tach - ((canh trang) or (canh tranh)) va tong cong toan phan cau*.