Perhaps you should try some spelling variations:
thanh trung » thanh tung
dung phuong » dung thuong, bang phuong, dung chung
chieu sach » chinh sach, chieu sang, chieu xanh
trung dap » trung cap, trung dai, trung dam
dap dung » ap dung, dan dung, dap ung
dan toan » van toan, dan than, manh toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - thanh trung dap dung phuong ((dan toan) OR (van ban)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chiet tach)) - thanh trung dap dung phuong ((dan toan) or (van ban)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chiet tach)) - thanh trung dap dung phuong ((dan toan) or (van ban)) cau*.