In the absence of group subtraction possibilities, I must resort to search queries like this:

groups contains "ContainsFunction" and not (groups contains "Earthquake")

Is it possible to have additional strings in the not clause? I tried the following without success:

groups contains "ContainsFunction" and not (groups contains "Earthquake", "Flood")

groups contains "ContainsFunction" and not (groups contains "Earthquake") and not (groups contains "Floods")

How can I get the intended result? Thanks.