I've searched through many suggested questions, including this possible duplicate but haven't found straight answer. I've dig through Our model and Advanced search tips, of course.
So, is it possible to build expressions like this and how?
([kerberos] OR [gssapi]) AND ([ios] OR [iphone])
And, subquestion, sort of: Is it possible to suscribe e-mail or RSS new question notification of such search somehow? I've found this option only for single tags...
Although I've read instructions about how to write good questions, help me improve my question if you feel it is needed, please.