Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung tham » trung tam, trung thanh, trung thang
tham nhung » thi nhung
nhung cong » dung cong, thong cong, hang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
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 hieu) or (theo tieu)) sach - thanh trung tham nhung cong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo tieu)) sach - thanh trung tham nhung cong ban than cau.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo tieu)) sach - thanh trung tham nhung cong ban than cau*.