The Advanced Search feature in Toodledo gives you great flexibility in creating views of your tasks. You can either create a custom view for one-time use or you can save the view as a Smart List.
For a good example, see instructions for setting up the Unprocessed list. Once you’ve done that, you are ready to start experimenting with Saved Searches.
To use your Saved Searches, click (left pane), then the appropriate search tab.