More than two years ago, I was giving some Tips to seek intelligently on Google, to obtain Results as relevant as possible in our searches. A “search” On Google shifts us mainly Web pages which contain the keywords and then ask the search to be done. 
If we are interested in looking for documents on Google, files .PDF, .DOC, .XLS, .PPT, .PS, .Dwf, .KML, .Cmz, .RTF, .SWF or even pictures .JPG, then you will have to limit much Aria de rezulati. Limiting the area of results helps us a lot when we want to look for, for example, document .XLS (Microsoft Excel Office) containing the word “contract“. i shall “Let's tell him” the search engine to look for the word “contract” and show us in the list of results only .xls documents, excluding web pages and other types of documents.
Advanced Search is a add-on of Mozilla Firefox which modifies the box “Google Search“, adding new Google search options or on open sites in tab-uri. 
With Advanced Search, before looking for something, we will have to choose where we want to look. On the site opened in tab or on Internet (Google, if default search engine is set).

To look for documents on Google, it is sufficient to type the keyword and to select the type of document.

Here is a concrete example. I searched for documents Microsoft Word Office, care contin cuvintele “Contract Vanzare“.

In Goolge s-au afisat numai Word documents care contin cuvintele “contract vanzare“.
Prin optiunea “Web Site“, cuvintele cheie vor fi cauate tot pe Google, insa vor fi afisate numai rezultate din pagina web deschisa in tab.

Iata cum arata rezultatul pentru cuvintele “Windows Tips“:

Advanced Search is a add-on foarte util pentru cine doreste sa nu piarda mult timp pe Google in cautarea unui rezultat relevant.
Download Advanced Search Add-on.
Aceasta extensie face cautarile pe HTTPS (encrypted.google.com / Beta SSL) giving additional safety. By establishing an SSL connection between your browser and Google, your information sought cannot be intercepted by a third person.
Advanced Search is an extension for Mozilla Firefox, but if you do not use this Internet Browser, you can look for Google documents or keywords on certain Google -indexed web pages, using Google Search Advanced Operators.
Add-on can be replaced very simply:
1. We open the address “https://encrypted.google.com” in any browser. (Opera, Firefox, Internet Explorer, Chrome, Safari, etc…)
2. We type the keyword, put space, then “filetype:pdf” (If we want to look for the keyword in files “PDF”.
Example: We are looking on Google with Internet Explorer, .pdf files which contain the word “DEMAnD“.

More syntaxes can be found here.
Advanced Search was tested on Mozilla Firefox 3.6.13.
 
			