Need advanced search on project!!!

Hi all, I have a project going which involves the search on various chemicals used in the pharma industry. I have tried searching on the net but all I land up is on the pages that I have already visited. I need to find something that is more than the usual information I have, need to access the web pages that store more information about them. Do you people know any thing that can help me find specific information on the net?

Your suggestions could make my project better