Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, bulgareiae, vulgariae, bulgeriae
bulgareien » bulgarien, bulgarian, bulgarie, bulgareeien, vulgareien, bulgereien
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, 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 bulgareien)) OR (bulgar OR bulge)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (bulgaria or bulgareien)) or (bulgar or bulge))*.