Customize search results by overriding the SearchResults class
You can customize Sitefinity's search results by using a customized SearchResults widget that inherits the SearchResults class. Then you can register the custom widget in the toolbox and use it on pages and page templates.
For more information, see Register a new widget in Sitefinity CMS toolbox.
Following is a code sample that demonstrates a customized overridden SearchResults class. It filters the list of search results to display only results published in the last 10 days, by overriding the Search method: