Perhaps you should try some spelling variations:
bulgarien » bulgarian, bulgareien, vulgarien, bulgerien
bulgareien » bulgarian, bulgarie, bulgariens, 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: ((bulgaria OR (bulgarien OR bulgareien)) OR bulgar).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bulgaria or (bulgarien OR bulgareien)) or bulgar)".
• Adding a wildcard symbol may retrieve word variants: ((bulgaria or (bulgarien OR bulgareien)) or bulgar)*.