Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, bulgareiae, vulgariae, bulgeriae
bulgareian » bulgarian, bulgarean, bulgaria, bulgareeian, vulgareian, bulgereian
bulgarisch » bulgarische, bulgarischen, bulgareisch, vulgarisch, bulgerisch
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 (bulgareian OR bulgarisch)) OR (bulgar OR (bulges OR bulge))).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (bulgareian or bulgarisch)) or (bulgar or (bulges or bulge)))*.