Perhaps you should try some spelling variations:
bulgerien » bulgariens, bulgarian, bulgarie
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, bulger
bulgarien » bulgareien, vulgarien, bulgerien, bulgarian
vulgare » vulgar, vulgaris, vulgarly
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 bulgaria) OR ((bulgar OR bulge) OR ((vulgare OR bulgarien) OR bilgere))).
• Adding a wildcard symbol may retrieve word variants: ((bulgerien or bulgaria) or ((bulgar or bulge) or ((vulgare or bulgarien) or bilgere)))*.