Perhaps you should try some spelling variations:
vulgaris » bulgaria, vulgar, vulgars, vulgares, bulgarias
vulgari » vulgar, vulgare, bulgaria
bulgeriae » bulgariae, bulgaricae, bulgaria
bulgar » bulgare, vulgar, bulger
bulgere » bulgare, bulger, bilgere

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: (((vulgaris OR vulgari) OR bulgeriae) OR (bulgar OR bulgere)).
• Adding a wildcard symbol may retrieve word variants: (((vulgaris or vulgari) or bulgeriae) or (bulgar or bulgere))*.