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Searches can be refined by adding more terms and constructing logical search statements. Different search engines handle multiple terms differently, often using an 'advanced search' page to set detailed search parameters. In PubMed and Medline, terms can be combined in a search statement using AND and OR logical operators. For example: 'dogs and hepatitis'; '"johne's disease" or paratuberculosis'. If AND and OR operators are combined in one statement, the AND part will be processed first, then the OR, unless the OR is contained in parentheses.