Perhaps you should try some spelling variations:
vulgares » vulgaris, vulgar, vulgarly, vulgars, vulgariss, vulgarlys
vulgarises » vulgarise, vulgarisee, vulgaris
bulgarien » bulgarian, bulgaria, bulgareien, vulgarien, bulgerien
vulgare » vulgar, vulgaris, vulgarly
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: (((((vulgares OR vulgarises) OR bulgarien) OR vulgare) OR vulgare) OR bulgar).
• Adding a wildcard symbol may retrieve word variants: (((((vulgares or vulgarises) or bulgarien) or vulgare) or vulgare) or bulgar)*.