Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, bulgareiae, vulgariae, bulgeriae
bulgerian » bulgarian, bulgarians, eulerian
bulgeriae » bulgaricae, bulgarian, bulgarie
bulgar » bulgare, vulgar, bulger
bulgaria » bulgareia, vulgaria, bulgeria
bulgarien » bulgareien, vulgarien, bulgerien, bulgarian

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 bulgerian) OR bulgeriae) OR ((bulgar OR bulgaria) OR bulgarien)).
• Adding a wildcard symbol may retrieve word variants: (((bulgariae or bulgerian) or bulgeriae) or ((bulgar or bulgaria) or bulgarien))*.