Search Operators for labels and folders

With a large library, I have encountered a number of situations where I would have liked to not only search articles by label (or by several labels) but to be able to do more complex searches. Specifically, I would like to be able to use OR , exclusive OR and NOT on both labels and folders - pretty much like what GMail does.

I understand that for some of these cases there are workarounds by rigorously using the folder structure but in reality things are rather chaotic and this feature would make finding things easier.

Please have a look at this thread which is about the same topic:

Indeed, didn’t see it when searching. Thanks