Keyword searches operate on IPTC data. The best way to do searches in Qimage is to add a description to folders (or images). For example, go to a folder of interest and enter a description in the "D:" box above the thumbnails. Qimage will record that description for the folder. If you do a regular search (and not a file name or keyword search), it is searching those: the descriptions you enter in Qimage.
I think I have to re-think how I name my print jobs. Currently I include the last 4 digits of the filename, paper, print size, paper size, maybe camera, maybe raw processor, other info. So one image might be printed on different papers, or similar images made with different cameras, etc. I'll often add exclamation signs at the beginning to make certain images easier to find.
I'm guessing that IPTC data won't pertain to job names in the Job list. And I don't see any way to edit/modify IPTC data in QU.
As my processing skills improve (oh! ever so slowly), and software improves, from time-to-time I go back and reprocess an old favorite to see if I can improve it much. Maybe a lighthouse image from a Nikon digital camera might turn out better than one from my Olympus PEN-F. But I keep the old print job just in case, maybe to print on a different paper.
On a slightly unrelated note: I noticed that there are a few *.job files in C:\ProgramData\ddisoftware\Job_Save, with some overlap to *.job files in C:\ProgramData\ddisoftware\Qimage\Save. I only do incremental backups of the 2nd folder. Any reason to to include the 1st folder?
And thanks for the filename search info, that one I should have been able to figure out. Forest and trees in this case, I think.
--George