Every person at one time or another finds themselves in the situation in which he/she needs to get information from the internet fast but cannot find the needed info. 
Most of the times this info is in PDF files that you may not find easily by normal search. So why not just search for the PDF files instead.
Most of the times this info is in PDF files that you may not find easily by normal search. So why not just search for the PDF files instead.>To do so just add “pdf” or “filetype:pdf” after your search topic.
>Press Enter or Click search
>You will be able to see [PDF] before the results, this means that the link will lead you to a PDF file.
>If the “quick view” option is there after the result, it means you can preview the PDF file using Google Docs before downloading it.The PDF will be opened for preview in a separate window.
Now you can get what you need quickly without going through multiple results which provide none of the info that you are searching for.