Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
dien anh » tieng anh, dien dan
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((dien sach) OR (dien anh)) - thanh trung cua dung cong dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((dien sach) OR (dien anh)) - thanh trung cua dung cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: doc ((dien sach) OR (dien anh)) - thanh trung cua dung cong dan than cau*.