Summary
Adding a search term to the QueryText property will search within the title, content, and summary of content. However, if you want the search term to match the title, content, summary OR another property (for example, a taxonomy category), you cannot use QueryText, since an AND operation is performed between the QueryText and any additional properties.
Solutions
To perform a query in which a term matches the title, content, summary, OR additional properties, add the following property instead of adding the term to the QueryText property: