Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, vulgariae, bulgarieiae
vulgarische » bulgarische, bulgarischen, bulgarischer
vulgarian » bulgarian, bulgarians, vulgaridad
bulgaria » vulgaria, bulgarieia
bulgar » vulgar, bulgarie
bulgare » vulgare, bulgariee, bulgarie, bulgarien
bulger » bulge, bulges

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 (vulgarian OR bulgaria))) OR ((bulgar OR bulgare) OR bulger)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (vulgarische or (vulgarian or bulgaria))) or ((bulgar or bulgare) or bulger))*.