Lightroom 7.0 (desktop) - how to export keywords list and how to filter search with keywords

Good day. I am a new user of Lightroom and started with 7.0 right away. 

I have a cloud album with my photos. I put several keywords for each photo for rapid and convinient search. 

First, I would like to export all keywords used list as a .txt or something similar, to review, make notes for my colleaugues, for myself and so on. I cannot find how to do it. It seems to me, LrC has such feature, but I need it in Lr 7.0. 

And another question - can I search among photos using keywords like "contain tagA and tagB in the same time" (I know I can), but how about "contain tagA but don't contain tagB" and "contain or tagA or tagB, or both of them"?? I see in LrC I can use !tagB to exclude these from search results, but in Lr 7.0 I don't understand does it work or not.

Could you help me, please?