Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, bulgareiae, vulgariae, bulgeriae
vulgaria » vulgaris, vulgari, vulvaria
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, bulger
bulgarien » bulgareien, vulgarien, bulgerien, 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 bulgaria))) OR ((bulgar OR bulgarien) OR bulges)).
• Adding a wildcard symbol may retrieve word variants: ((bulgereiae or (bulgariae or (vulgaria or bulgaria))) or ((bulgar or bulgarien) or bulges))*.