Perhaps you should try some spelling variations:
bulgarian » hungarian, bulgareian, vulgarian, bulgerian
bulgarisch » bulgarische, bulgarischen, bulgareisch, vulgarisch, bulgerisch
bulgaria » bulgareia, vulgaria, bulgeria
bulgarien » bulgareien, vulgarien, bulgerien
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 (bulgarian OR bulgarisch))) OR (bulgar OR bulge)).
• Adding a wildcard symbol may retrieve word variants: ((bulgaria or (bulgarien or (bulgarian or bulgarisch))) or (bulgar or bulge))*.