Your search could be as simple as 'butterfly' or 'summer.' Just keep in mind, the search function can't 'read images,' just file names and folder names. It's also helpful to click 'View' on your menu bar and choose 'Large Icons.' (That way you can see the images instead of file names.)
All DJ images are named like this: DJI_product name_image name.
Unless you're working with very old DJ floppy images, we've tried to keep our file naming pretty straight forward and use names like girl 1 (instead of Abby).
By default, your search will return results that include your search word in the folder name OR the file name (alphabetically). You may need to try another word or search term if you get no (or few) results.
So if you have
Zen Doodle Butterflies, that whole download
folder will be in your results, along with every individual butterfly image from that set and every other set you have in that folder.
NOTE the green progress bar. Let it finish (turn white again) if you want to see all results in that folder. Our search had returned 322 so far, but finished with 439 butterflies!!