In the Tag brwswer:
Multi select, the same as you use with your O/S
Click the first:
Hold (and hold) the control-key: click each one yo want (A Green + will appear)
click again and a Red - will appear, meaning 'but NOT'. Click till no marks to change your mind on that item
Once selected, launch the search as normal
At the bottom of the Tag Browser, there is a button 'Alter Tag Browser'
Set the search type (before
) to All (must be ) or Any