Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, vulgariae, bulgeriae, bulgariaiae
vulgarische » bulgarische, bulgarischen, bulgarischer
bulgarien » bulgarian, bulgaria, vulgarien, bulgerien, bulgariaien
vulgaria » bulgaria, vulgaris, vulgari
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: ((bulgariae OR (vulgarische OR (bulgarien OR vulgaria))) OR ((bulgar OR bulgare) OR bulge)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (vulgarische or (bulgarien or vulgaria))) or ((bulgar or bulgare) or bulge))*.