Perhaps you should try some spelling variations:
vulgariae » bulgariae, vulgarise, bulgaricae
bulgaren » bulgarien, bulgarean, bulgare, bulgareen, vulgaren, bulgeren
bulgarian » bulgaria, hungarian, bulgareian, vulgarian, bulgerian
bulgeria » bulgaria, bulweria, bulgarica
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: (((vulgariae OR bulgaren) OR (bulgarian OR bulgeria)) OR (bulgar OR bulge)).
• Adding a wildcard symbol may retrieve word variants: (((vulgariae or bulgaren) or (bulgarian or bulgeria)) or (bulgar or bulge))*.