Perhaps you should try some spelling variations:
dien sach » dien anh
chua xang » chua nang, chuc nang, chu bang
xang cong » dang cong, bang cong, hang cong
cong manh » cong danh, duong manh, cong thanh
doc dien » duoc dien, doi dien, do dien
anh dang » anh dong, anh dung, anh bang
manh van » anh van, menh van, canh van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc dien sach - ((canh tranh) or (anh dang)) chua xang cong manh van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc dien sach - ((canh tranh) OR (anh dang)) chua xang cong manh van ban.
• Adding a wildcard symbol may retrieve word variants: doc dien sach - ((canh tranh) or (anh dang)) chua xang cong manh van ban*.