Perhaps you should try some spelling variations:
bulgere » bulgare, bulger, bilgere
bulgarien » bulgarian, bulgaria, bulgareien, vulgarien, bulgerien
vulgare » vulgar, vulgaris, vulgarly
bulgar » bulgare, vulgar, bulger
bulgeria » bulgaria, bulweria, bulgarian

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: ((((bulgere OR bulgarien) OR vulgare) OR vulgare) OR (bulgar OR bulgeria)).
• Adding a wildcard symbol may retrieve word variants: ((((bulgere or bulgarien) or vulgare) or vulgare) or (bulgar or bulgeria))*.