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 :
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.
Search engine in various languages for documents , pdf , presentations and spreadsheets.
Searches through “1045691″ of PDF documents and ebooks found in the world wide web.
This search will find documents on school, college and university websites .
9 – Osun
Searches for doc , pdf and ppt
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 .