How can you improve your keyword search results? by using limiters to narrow and focus your keyword search by making your keyword search as broad as possible by using only hard copies of research materials by relying on one search engine's results so you don't get too many a search engine uses machines to index webpages; a gateway is compiled by experts or librarians. a search engine searches for images; a gateway searches for text only. a search engine is simpler to use; a gateway requires the searcher to use scientific terms. a search engine is free; a gateway requires payment for the subscription to the service. a metasearch engine searches directories and databases for text only. a metasearch engine compiles information from subscription databases and publishes them. a metasearch engine searches for digital and audio files and indexes them by category. a metasearch engine searches the databases of multiple search engines simultaneously.