Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, bulgareiae, vulgariae, bulgeriae
bulgarean » bulgarian, bulgaren, bulgarians, bulgareean, vulgarean, bulgerean
bulgarica » bulgaria, bulgarisch, bulgarian, 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: ((bulgariae OR (bulgarean OR bulgarica)) OR (bulgar OR (bulges OR bulge))).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (bulgarean or bulgarica)) or (bulgar or (bulges or bulge)))*.