I want a recipe search site / engine with a function that excludes multiple ingredients.?

I have multiple food sensitivities. I would like to search for recipes WITHOUT ingredients. For example: Bread: wheat-, gluten-, soy-, potato-free. Chili: no tomatoes, n chilis. Pasta Sauce: no tomatoes, no rosemary, no oregano, no wheat. Recipezaar.com approximates this, but since I don't know what to substitute for the main ingredient, it is hard to put stuff in their sorter. OR I am just flunking recipe websites willy-nilly. Thanks!