Perhaps you should try some spelling variations:
thanh trung » thanh tung
tieu sach » chieu sach, dien sach, te sach
tam tong » tai tong, tam song, tam thuong
tam nong » lam nong, tam duong, tam huong
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: theo tieu sach - thanh trung ((tam tong) OR (tam nong)) cong dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - thanh trung ((tam tong) OR (tam nong)) cong dan than cau*".