Perhaps you should try some spelling variations:
bulgarien » bulgarian, bulgareien, vulgarien, bulgarieien
bulgarica » bulgarisch, bulgarian, bulgarie, bulgareica, vulgarica, bulgarieica
bulgaria » bulgareia, vulgaria, bulgarieia
bulgar » bulgare, vulgar, bulgarie
bulger » bulges
bilgere » bilger, bilgeri, billigere

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 bulgarica)) OR ((bulgar OR bulger) OR (bulge OR bilgere))).
• Adding a wildcard symbol may retrieve word variants: ((bulgaria or (bulgarien or bulgarica)) or ((bulgar or bulger) or (bulge or bilgere)))*.