Not really. We can get you to a page about Recipes from Bulgaria, but in a quick scan didn’t find a recipe for anything pie-like. Some of the recipes are in Bulgarian, though, but in the Roman alphabet.
You might also like to check Traditional Bulgarian Cooking (Canada, UK) and Bulgarian Rhapsody: The Best of Balkan Cuisine (Canada, UK), both of which are back in print in new editions. Sadly, we have neither on hand to help in answering your question.
Our Practical Encyclopedia of East European Cooking (Canada, UK), which is nearly always close at hand, has very appealing recipes for Bulgarian Lamb in Pastry, Fish Baked in a Dough Jacket, and Cherry Strudel, but none of them qualify as pies in our book. Sorry.