The 'Advanced Search' is recommended. Here you can choose specific fields to be searched by clicking on the dropdown menus adjacent to the search boxes.
Limit your search. Search results can be limited in a variety of ways. On the left-hand side of the results page under Narrow results you may select sources by type (trade journals, newspapers, wire feeds, scholarly journals, or magazines). Sources may also be selected by title (Wall Street Journal, PR Newswire, etc.), document type, keyword, classification, company, location, date, and more.
Notice in the example pictured below: