Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
cong cong » cong dong, trong cong, dung cong
ho chiet » ho chieu, ho thiet, hoc thiet
cong san » cong tac
can cau » van cau, ca cau, cac cau
ban cau » bang cau, ban can, van cau

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

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