Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
hanh mang » nhanh mang, hanh trang, nhanh lang
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - ((thanh cong) OR (hanh mang)) ((cua dung) OR (cua dang)) cong tan van ban~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - ((thanh cong) or (hanh mang)) ((cua dung) or (cua dang)) cong tan van ban*.