This is a very effective way to find volumes of information on a particular subject very quickly. Some Search Engines are organized in categories. To find specific subjects in these engines, you first look in the general category which fits your topic, then the categories become increasingly refined until they contain only documents of a very specific nature. Some Search Engines will allow you to use a keyword search on a specific category, which can also be very effective. Tips for Obtaining Good Results Be as specific as you can.
Correct spelling is essential.
Use keywords which are unique to the subject you wish to find.