Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, bulgareiae, vulgariae, bulgeriae
bulgariaisch » bulgarisch, bulgarische, bulgarians, bulgareiaisch, vulgariaisch, bulgeriaisch
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: ((bulgariae OR (bulgaria OR bulgariaisch)) OR (bulgar OR bulge))*.