I want to know how those two suites bring results http://pdftrace.com/ http://pdfgoo.com/ the two sites are the same is that by google api and what are the php codes which bring the description and the full link which brings the pdf files and am i in need to have google api key every time i ask no one give me usefull answers i don't know the reason and hope that doesn't happen this time
There are many pdf search engine scripts available online. Just search on Google for the keyword 'pdf search engine scripts'