Perhaps you should try some spelling variations:
thanh trung » thanh tung
tieu sach » chieu sach, dien sach, te sach
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
san than » sang than, san thanh, ban 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: theo tieu sach - ((thanh trung) or (thanh cong)) cua dung cong san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((thanh trung) OR (thanh cong)) cua dung cong san than cau.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((thanh trung) or (thanh cong)) cua dung cong san than cau*.