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If you are researching two unrelated topics, perform two separate searches. Using AND in your search (see below) finds only pages containing both words.
Using AND, OR, NOT, and Other Search Features
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Medical terms can be difficult to remember, and often there are many names for a single concept (e.g., cancer of the colon, colonic neoplasm, colon cancer, etc.). Thus, Genetics Home Reference automatically adds words related to those you entered. This may increase the number of results retrieved.
Synonyms added to a search can be viewed on the Query Details page.