Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
dung chung » dung cong, dung ung, dung trung
cang thang » cong thanh, dang thanh
bang than » bang thanh, ban than, sang than
cong van » cong vang, cong san, song van
van dung » van dong, xay dung, tin dung

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 - thanh cong van dung chung ((bang than) or (cang thang)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - thanh cong van dung chung ((bang than) OR (cang thang)) cap.
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - thanh cong van dung chung ((bang than) or (cang thang)) cap*.