Alas, these vital research aids all seem to have their own way of doing things, so if you want to search more effectively, take the time to click on the Help or Advanced Search button and learn the conventions. Searching the web with these engines can be inefficient, but if you state your search terms well, you'll have to wade through much less garbage to find the good stuff.
Some websites offer more specialized searches.
For example, Fedstats lets you search for online information from more than 70 US government agencies. Be sure that you have Adobe Acrobat installed on your computer. Download a PDF file, open it with Acrobat, and you have on your computer screen an exact copy of the original. You can download the latest version of Acrobat Reader free from Adobe . Some websites offer you a choice of download formats.