Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
cong danh » cuong danh, cong dan, cong thanh
cong thu » cong thuc, cuong thu, hong thu
thu dang » thu hang, thu bang, thu dong
danh van » doanh van, dang van, dinh van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chieu sach)) - thanh cong thu dang cong danh van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu sach)) - thanh cong thu dang cong danh van ban.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu sach)) - thanh cong thu dang cong danh van ban*.