Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, bulgareiae, vulgariae, bulgeriae
bulgarischer » bulgarischen, bulgarische, bulgarisch, bulgareischer, vulgarischer, bulgerischer
bulgarien » bulgarian, bulgareien, vulgarien, bulgerien
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, bulger
bulgariee » bulgareiee, vulgariee, bulgeriee, bulgarie, bulgariens, bulgaricae

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