Perhaps you should try some spelling variations:
bulgerien » bulgarien, bulgariens, bulgarie
bulgariia » bulgaria, bulgarica, bulgaricae, bulgareiia, vulgariia, bulgeriia
bulgar » bulgare, vulgar, bulger
bulgarian » bulgareian, vulgarian, bulgerian, bulgaria, hungarian
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: ((bulgerien OR bulgariia) OR ((bulgar OR bulge) OR (bulgarian OR bilgere))).
• Adding a wildcard symbol may retrieve word variants: ((bulgerien or bulgariia) or ((bulgar or bulge) or (bulgarian or bilgere)))*.