Perhaps you should try some spelling variations:
bulgaricae » bulgarica, bulgarische, bulgarian, bulgareicae, vulgaricae, bulgericae
vulgaria » vulgaris, vulgari, vulvaria
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: ((bulgaricae OR (bulgaria OR vulgaria)) OR (bulgar OR bulge)).
• Adding a wildcard symbol may retrieve word variants: ((bulgaricae or (bulgaria or vulgaria)) or (bulgar or bulge))*.