Craft's search functionality, powerful as it may be, is not as end user friendly as you'd like it to be. With Easy Search, your content editors can use predefined search queries ("search for all entries with an image field that's not empty") or build their own search query with a user friendly GUI.
Price includes 1 year of updates.
$9/year per site for updates after that.
To install this plugin, search for its package name on the Plugin Store and click “Install”.