Perhaps you should try some spelling variations:
vulgariae » bulgariae, vulgarise, bulgaricae
bulgarian » bulgaria, hungarian, bulgareian, vulgarian, bulgerian
bulgarica » bulgaria, bulgarisch, bulgarien, bulgareica, vulgarica, bulgerica
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 (bulgarian OR bulgarica)) OR (bulgar OR (bulge OR bulges))).
• Adding a wildcard symbol may retrieve word variants: ((vulgariae or (bulgarian or bulgarica)) or (bulgar or (bulge or bulges)))*.