Perhaps you should try some spelling variations:
bulgariae » bulgaria, bulgarian, bulgarians
bulgaricae » bulgarica, bulgarische, bulgaria
bulgarie » bulgaria, bulgarian, vulgaris
bulgarien » bulgarian, bulgariann, vulgarisn, bulgaria
vulgare » vulgar, vulgaris, vulgarly
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 bulgaricae) OR ((bulgarie OR (bulgarien OR vulgare)) OR bulger)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or bulgaricae) or ((bulgarie or (bulgarien or vulgare)) or bulger))*.