The "words and phrases" advanced filter works in a way that is not immediately clear to the user. The text box allows free text entry but also has a dropdown list. When you type in free text, if the search term isn't already in the list of terms in the dropdown list, the search ignores the result. The user may take this to mean that there are no cases with that search term in the "words and phrases" section when that isn't correct. It ends up misleading the user.

Also, I struggled to find any help article that explains how that particular filter actually works nor explains what are its limitations.