This document search engine can understand most search operators including

site:, intitle:, inurl:,site:edu (for searching university sites )

So you can easily filter junk results

If you want to search only documents from university websites.Just search for

site:edu Nanotechnology

Advantage of using DocJax document search over regular web search

Inline Preview : It shows the preview of content present in the documents.

It is integrated with Scribd, you can view the entire document without downloading it

Advantages over Google search:

You can search for documents in Google using the filetype operator.But this has few drawbacks

1. Google doesn’t provide “View as HTML” for some documents, then you have to download the entire document to view the what is present inside.

2. If you want to search multiple files then the search syntax gets complex.(example:nanotechnology filetype:doc OR filetype:pdf OR filetype:xls).

[Via] Document Search

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Search PDF, DOC, XLS and PPT Documents with DocJax