Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
phan dang » phan dau, phan cong, nhan dan
gian dan » gian lang
van dung » van dong, xay dung, tin dung
dung ung » dung cong
van chat » cao chat
thu van » thuc van, thuy van, tu van

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 - ((phan dang) or (gian dan)) van dung ung thu van chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - ((phan dang) OR (gian dan)) van dung ung thu van chat*.