Search users in several groups

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When searching for user in dashboard and selecting several groups in the group(s) criteria box it returns only users that are assigned to all selected groups.

Example:

Person1 is in groupA
Person2 is in groupB

I wan't to find persons in those 2 groups. But by entering GroupA and GroupB in the search, it will return none because the users are not assigned to both GroupA and GroupB.

Also it is not possible to add group as an extra filter.... only group sets. (otherwise this could have been a solution)

Am I missing something here or is this simply not possible?

Regards.