Perhaps you should try some spelling variations:
thanh trung » thanh tung
tieu sach » chieu sach, te sach, viet sach
dien sach » dien anh
tam nong » lam nong, tam duong, tam huong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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) OR (dien sach)) - thanh trung tam nong ((cong dan) or (cong san)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu sach) OR (dien sach)) - thanh trung tam nong ((cong dan) OR (cong san)) than cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sach) OR (dien sach)) - thanh trung tam nong ((cong dan) or (cong san)) than cau*".