Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarie, bulgareiae, vulgariae, bulgeriae
bulgarian » bulgaria, bulgareian, vulgarian, bulgerian
bulgarisch » bulgarische, bulgarischen, bulgareisch, vulgarisch, bulgerisch
bulgar » bulgare, vulgar, bulger
bulges » bulge

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 ((bulgarian OR hungarian) OR bulgarisch)) OR (bulgar OR bulges)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or ((bulgarian or hungarian) or bulgarisch)) or (bulgar or bulges))*.