I miss the feature of searching text in folder names. In the article "Searching by text" (https://support.captureone.com/hc/en-us/articles/360002524657-Searching-by-text) it is stated that you can search text in folder names - but actually you cant (which has been confirmed by Victor in your support). It's a common feature in other programs, eg LR and ACDsee - and should of course also be a feature in C1.
When you are able to search text in folder names it would suffice to give the folders descriptive names, so you could spare yourself the effort of giving each and every image keywords - or renaming the file names