Perhaps you should try some spelling variations:
chiet tach » chieu sach
doc chiet » doc hieu, hoc thiet, doc chat
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
thanh hai » thanh phan, thanh hoa
tang cua » mang cua, hang cua, tang luan
cua dung » cua dang, cua dong, qua dung
cong ban » cong bang, cong san, cong tan

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "doc chiet tach - hanh tang cua dung cong ban ((thanh hai) OR (thanh san))~".
• Adding a wildcard symbol may retrieve word variants: doc chiet tach - hanh tang cua dung cong ban ((thanh hai) OR (thanh san))*.