Many times we have tried searching for pdf/chm books online and using our ordinary search queries, rarely give any results fast. But with a simple geeky search you can find what you want in first page of Google Search Result.
I am just giving the method and you can try and verify it yourself.
In the first case I am using just the Book Name as the search query in google.
In the second method instead of using just the Book Name, use the following query for searching in Google.
Results are incredibly different. Instead of being taken to their Website you can access their website just as you access various directories in your computer and download it at ease.
NB: Never use this method for downloading WAREZ from illegal websites. Hope you would use it right way.
In one of the following posts I will explain about the various Advanced Search Operators which can be used while searching on internet with Google.