Cynthia,

           See:  https://cybertext.wordpress.com/2010/01/25/word-find-highlighted-text/  and use find to find "find function" to get straight to the meat of the matter for the method you'll use.

           If you don't like that tutorial, then have a look at the others returned by this DuckDuckGo Search:  https://duckduckgo.com/?q=MS-Word+search+for+highlighted+text 
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Brian - Windows 10 Pro, 64-Bit, Version 2004, Build 19041  

The purpose of education is not to validate ignorance but to overcome it.
       ~ Lawrence Krauss