Heres another more direct method for searching for ebooks on google.
This returns more results that are more true...
I want to search for an abook that is probally being sold on the net. The ebook is called GetRich
I would type...
That will return sites that have that particular ebook on them with a direct link to the book itself.
Basically the search term is "filetype:"
Directly after the ":" type the file extention pdf, rar, zip whatever, then space and name of what you are looking for.
Give it a shot!