Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
tieu sach » chieu sach, dien sach, te sach
ban thanh » ban hanh, ban hang
thanh cau » thanh chau, thanh mau, nhanh cau
cong ban » cong bang, cong san, cong tan

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 - ((hanh trung) or (canh tranh)) va nhung cong ban thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((hanh trung) OR (canh tranh)) va nhung cong ban thanh cau.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((hanh trung) or (canh tranh)) va nhung cong ban thanh cau*.