(Technician is Tom Preston or Technician is Unassigned) and 

(Request Status is not Closed and Request Status is not Canceled)

In other words; I want to see all my requests that haven't been closed or canceled...and I want to see Unassigned requests to.

The problem I'm having is with the Unassigned part. You can't select Unassigned or None for Technician. So how can I make this work? There must be a way since there is a predefined view for Unassigned requests.