In this example from the Web of Science database, you can use the Basic search form to add multiple search lines by clicking on Add Another Field. Sometimes you will have to access the Advanced Search for these options. Select the Query Builder tab to construct your Boolean Search Query. AND searches find all of the search terms. THE BOOLEAN 'OR' The Boolean operator OR allows you to broaden a concept and include synonyms. Use the Browse button to select which folders to search in. There are three basic Boolean search commands: AND, OR and NOT. Computer Science Department, University of Sheffield, Sheffield, United Kingdom. Many databases offer the functionality to separate out your search terms, and this saves you having to add the parentheses. Boolean Search uses a combination of keywords and the three main Boolean operators ( AND, OR, and NOT) to organize and sift through your searches. At the bottom of the dialog, select: Create a custom Search Folder. Refining Boolean queries to identify relevant studies for systematic review updates. If one term is contained in the document and the other is not, the item is not included in the resulting list.
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