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Web of Science's Advanced Search allows you to build a search using field tags, Boolean expressions, and set combinations. Select which database collection you would like to search in. Select the search field from the drop-down menu, type in your keyword, then hit "Add to query." Your search string will then appear in the "Query Preview" box. Once you are satisfied with your query, hit "Search." You can also add previous searches to a new search query from the "History" box.