Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
bang cong » dang cong, bang song, hang cong
trang va » tran van, hang va
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than tap » toan tap, han tap, phan tap
luan » quan, lan

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 ((trang va) or (luan van)) bang cong ban than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh ((trang va) OR (luan van)) bang cong ban than tap.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh ((trang va) or (luan van)) bang cong ban than tap*.