Perhaps you should try some spelling variations:
bulgaricae » bulgarische, bulgaria, bulgarian, bulgariae, bulgariane, bulgareicae, vulgaricae, bulgericae
bulgarica » bulgaria, bulgarisch, bulgarian, bulgareica, vulgarica, bulgerica
bulgarien » bulgarian, bulgaria, bulgareien, vulgarien, bulgerien
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: ((bulgeriaiae OR (bulgaricae OR (bulgarica OR bulgarien))) OR (bulgar OR bulge)).
• Adding a wildcard symbol may retrieve word variants: ((bulgeriaiae or (bulgaricae or (bulgarica or bulgarien))) or (bulgar or bulge))*.