Perhaps you should try some spelling variations:
bulgarien » bulgarian, vulgarien, bulgerien, bulgarieien
bulgaria » vulgaria, bulgeria, bulgarieia
bulgar » vulgar, bulger, bulgarie
bulgare » vulgare, bulgere, bulgariee, bulgarie, vulgares

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