Hi Nicole,
First, I think your criteria is similar to
WHERE Participant Type = "Sender" AND (Participant Type = "To Recipient" OR Participant Type = "CC Recipient")
That criteria is applied for every single participant party and of course there's no participant party have both "Sender" and "Recipient" Type at the same time --> No result.
Second, because of fact above, I don't think you can archive your goals with CRM Advance Find. To do this in SQL, you usually need to write 2 SELECT query (1 for Sender and 1 for Recipient) and INTERSECT the result.
Hope it helps.