Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, bulgareiae, vulgariae, bulgeriae
vulgaris » bulgaria, vulgar
bulgariaisch » bulgarisch, bulgarische, bulgarians, bulgareiaisch, vulgariaisch, bulgeriaisch
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 (vulgaris OR bulgariaisch)) OR (bulgar OR bulge)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (vulgaris or bulgariaisch)) or (bulgar or bulge))*.