Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
canh manh » canh tranh, cach mang, van manh
lanh manh » lanh tranh, lan anh, van manh
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san hang » san chang, ban hang, van hang
hang dau » hang va, hang tai

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) OR (lanh manh)) ((cua nhung) or (va nhung)) cong san hang dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - ((canh manh) OR (lanh manh)) ((cua nhung) OR (va nhung)) cong san hang dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - ((canh manh) OR (lanh manh)) ((cua nhung) or (va nhung)) cong san hang dau".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - ((canh manh) OR (lanh manh)) ((cua nhung) or (va nhung)) cong san hang dau*.