If you are looking for documents on the internet , you ‘d rather use specialized search engines which will bring you documents with indicated extensions such as word , pdf , ppt .Here is a compilation of the best document search engines I found online :
1- DocJax
docjax
2-Searchdocs
Use this search engine to find documents in the following ‘Documents Sharing Communities’
3-Find a PDF
Search PDF Files Easily and Quickly
4 – PDFfind
Search only PDF files online
5 – Brupt
Document Search Engine based on Google Customized Search.
6- 09h15
Search engine in various languages for documents , pdf , presentations and spreadsheets.
7- TypePDF
Searches through “1045691” of PDF documents and ebooks found in the world wide web.
8 –FreeBookSearch
This search will find documents on school, college and university websites .
9 – Osun
Searches for doc , pdf and ppt
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10 – PDF Search Engine
Searches for documents with the following extensions : doc , pdf , chm , rft , txt
Please feel free to suggest more links to document search engines .
All Sharing 
Dec 16, 2010 @ 13:17:39
Very useful, thank you!
Jan 06, 2011 @ 18:39:45
I was familiar with Scribd and Google Docs but appreciate knowing about these other options. I’m going to try DocStoc and Gazhoo. They look promising.
Apr 25, 2011 @ 08:38:22
RT@MatAbraz: New useful search engine that returns full PDF scientific articles not subject to access fees http://www.freefullpdf.com
May 25, 2011 @ 13:31:31
You might want to take a look into http://searchadocument.com. I have found it to be easy and very helpful.
Aug 09, 2011 @ 01:35:26
Another pdf search engine is http://searchpdffiles.com, thanks for sharing
Apr 23, 2012 @ 08:38:35
Have you tried http://www.socachat.com ? It is phenomenal!!!!
Jan 27, 2013 @ 04:22:31
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Jan 27, 2013 @ 08:28:45
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Feb 15, 2013 @ 17:21:20
your missing this one http://dum.im the largest document search engine, by the way thank’s for sharing.
Feb 17, 2013 @ 00:12:36
You should take a look at http://findthatpdf.com Although it only searches .pdf’s there are millions of them. It also searches the text in the first few pages to make sure you get the best most relevant results
Apr 14, 2013 @ 00:37:47
If your searching just for .doc’s you can use http://findthatdoc.com It have over 30 million doc files and indexes the text content as well.
Apr 24, 2013 @ 14:17:24
My family members always say that I am killing my time
here at web, but I know I am getting experience everyday by reading thes
pleasant articles or reviews.
May 07, 2013 @ 08:51:12
This internet site is my intake, very great style and perfect content.
Jul 19, 2013 @ 21:23:29
May I just say what a comfort to find somebody who truly knows what they are discussing on the
internet. You definitely realize how to bring an issue to
light and make it important. More people have to read this
and understand this side of your story. I was surprised you aren’t more popular since you definitely have the gift.
Jul 24, 2013 @ 12:57:41
and were is http://pickpdf.com ?
Jul 24, 2013 @ 13:01:22
the most useful find in PDFs files it’s http://redirectfiles.org !!!
Aug 19, 2013 @ 10:22:00
if you search the document with different format, you can get document with format here http://www.whereisdoc.com/
Aug 31, 2013 @ 13:39:56
Thank You
Nov 07, 2013 @ 08:48:30
Thakes a lot for sharing this. I found a search enging. You can visit here also.
http://www.thatlive.com