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