Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, bulgareiae, vulgariae, bulgeriae
vulgaria » bulgaria, vulgaris, vulgari
bulgarisch » bulgarische, bulgarischen, bulgareisch, vulgarisch, bulgerisch
bulgar » bulgare, vulgar, bulger
bulgarie » bulgareie, vulgarie, bulgerie, bulgarien, bulgaria, bulgarian
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: ((bulgereiae OR (bulgariae OR (vulgaria OR bulgarisch))) OR ((bulgar OR bulgarie) OR bulges)).
• Adding a wildcard symbol may retrieve word variants: ((bulgereiae or (bulgariae or (vulgaria or bulgarisch))) or ((bulgar or bulgarie) or bulges))*.