Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
canh manh » lanh manh, canh tranh, cach mang
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung
van tuan » van ban, anh tuan
van quan » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - canh manh cua dung trong ((van tuan) or (van quan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - canh manh cua dung trong ((van tuan) OR (van quan)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - canh manh cua dung trong ((van tuan) or (van quan)) cau*.