Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarians, bulgareiae, bulgeriae
bulgarie » bulgarien, bulgarian, vulgaris, bulgareie, bulgerie
bulgerian » bulgarian, bulgarians, eulerian
bulgaria » bulgareia, bulgeria
bulgar » bulgare, bulger

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((bulgariae OR (bulgaria OR (bulgarie OR bulgerian))) OR (bulgar OR vulgar)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (bulgaria or (bulgarie or bulgerian))) or (bulgar or vulgar))*.