Perhaps you should try some spelling variations:
vulgariae » bulgariae, vulgarise, bulgaricae
bulgarean » bulgaren, bulgarians, bulgarien, bulgareean, vulgarean, bulgerean
bulgarian » hungarian, bulgareian, vulgarian, bulgerian
bulgaria » bulgareia, vulgaria, bulgeria
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 bulgarean) OR (bulgarian OR bulgaria)) OR (bulgar OR bulge)).
• Adding a wildcard symbol may retrieve word variants: (((vulgariae or bulgarean) or (bulgarian or bulgaria)) or (bulgar or bulge))*.