Except for the night train from Munich to Venice, there is not a direct (no train change) connection between Munich and Venice. There are four daily EC over Brenner Pass to Italy, but the closest they get to Venice is Verona, and you have to take an Italian train (booked from Italy) from Venice to Verona. Usually, the Bahn does not show a price for online tickets for a trip with a segment entirely inside Italy. You can see fares (both standard and discounted Europa-Spezial fares) and order tickets with reservations online for those trains from Munich to Verona, but the Bahn does not sell pass holder reservation alone online for those trains.