Finding any e-book using Google

Being a student myself, i require ebooks to boost my knowledge.
The following three queries are so powerful, that you can find almost any ebook on google using these.
1.
intitle:index.of?file_extension book_info
Examples-

• intitle:index.of?chm syngress
• intitle:index.of?chm hacking
• intitle:index.of?chm “Hacking for Dummies”

2.
+(“index of”) +(“/ebooks”|”/book”|”/ebook”|”/books”) +(chm|pdf|zip|rar) +book_info
Examples-

• +(“index of”) +(“/ebooks”|”/book”|”/ebook”|”/books”) +(chm|pdf|zip|rar) +syngress
• +(“index of”) +(“/ebooks”|”/book”|”/ebook”|”/books”) +(chm|pdf|zip|rar) +hacking
• +(“index of”) +(“/ebooks”|”/book”|”/ebook”|”/books”) +(chm|pdf|zip|rar) +”Hacking for Dummies”

3.
allinurl: +(rar|chm|zip|pdf|tgz) book_info
Examples-

• allinurl: +(rar|chm|zip|pdf|tgz) syngress
• allinurl: +(rar|chm|zip|pdf|tgz) hacking
• allinurl: +(rar|chm|zip|pdf|tgz) “Hacking for Dummies”

If you still can’t find any ebook, then you can contact me using the comments
Enjoy!!!