To find eBook in FTP Search, visit one of this website
http://search.ftphost.net/
http://www.filesearching.com/
http://reliz.ru/
http://www.narlytime.com/
e.g. if you want to search " Sams Teach Yourself " just type Teach Yourself, you will have some eBooks in some FTP servers.
also can be found with specific format (e.g. PDF & CHM)
If can't find what you want use google.
Here are some tips to helps you find eBooks with Google:
Find Apache's (default) Index page
Try this query:
+("index of") +("/ebooks"|"/book") +(chm|pdf|zip|rar) +apache
Find a particular eBook file
Try this query:
allinurl: +(rar|chm|zip|pdf|tgz) TheTitle
new search in google:
intitle:"index of*" inurl:"ebook name" or intext:"ebook name"pdf,txt or doc
e.g * I using as "any word there"