Other search engines are MetaSearch engines, that allow you to search many databases with one search. Examples of meta search engines are Dogpile , and Metacrawler . In addition, there are Web Indexes which are catalogs, or directories, that give you tools for browsing. Organization of indexes may be alphabetically, or by topic. Examples of these are Academic Info , which searches educational resources, and Librarians' Index to the Internet , which provides annotated searches.
Specific sites have their own searching capabilities.
PE-Talk has an archive search available. This can be used to find what has been written on topics. At ERIC , the Educational Resource Information Center, you retrieve citations and abstracts for education-related literature relevant to your search topic. This site is one of the most comprehensive sites available. Most search engines allow the use of boolean operators.