Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
ban thanh » ban hanh, ban hang
hieu cac » hieu luc, hieu va, hieu van
va trong » va truong, va thong, va tuong
cong ban » cong bang, cong san, cong tan
thanh ca » thanh cha, thanh cac, thanh ha
cong va » dong va, cong ha, cong tac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((thieu sach) or (hieu cac)) - thanh cong va trong cong ban thanh ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sach) OR (hieu cac)) - thanh cong va trong cong ban thanh ca.
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) or (hieu cac)) - thanh cong va trong cong ban thanh ca*.