Using computerized literature databases what is the best procedure to narrow a topic to locate a reasonable number of documents?

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Combining terms in a search is the best procedure to narrow a topic and locate a reasonable number of documents. This allows for a more targeted and specific search, reducing the number of irrelevant results. A Thesaurus of terms can be helpful in generating search terms, but it does not necessarily narrow the topic. Limiting the search process to a specific time frame may also be useful, but it can potentially exclude relevant older literature. Having a good understanding of the topic is important, but it does not necessarily narrow the search.

Using Computerized Literature Databases What Is the Best Procedure to Narrow