Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, vulgariae, bulgeriae, bulgariaiae
vulgaria » bulgaria, vulgaris, vulgari
bulgarien » bulgarian, bulgaria, vulgarien, bulgerien, bulgariaien
bulgar » vulgar, bulger, bulgaria
bulgare » vulgare, bulgere, bulgariae, bulgarie, bulgaria

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: ((bulgaars OR ((bulgariae OR vulgaria) OR bulgarien)) OR (bulgar OR bulgare)).
• Adding a wildcard symbol may retrieve word variants: ((bulgaars or ((bulgariae or vulgaria) or bulgarien)) or (bulgar or bulgare))*.