Perhaps you should try some spelling variations:
bulgaars » bulgare
bulgaricae » bulgarica, bulgarische, bulgaria, bulgareicae, vulgaricae, bulgericae
bulgarien » bulgarian, bulgaria, bulgareien, vulgarien, bulgerien
bulgariens » bulgarians, bulgarias, bulgarian, bulgarie, bulgareiens, vulgariens, bulgeriens
vulgaris » bulgaria, vulgar
bulgar » bulgare, vulgar, bulger

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 ((bulgaricae OR (bulgarien OR bulgariens)) OR vulgaris)) OR bulgar).
• Adding a wildcard symbol may retrieve word variants: ((bulgaars or ((bulgaricae or (bulgarien or bulgariens)) or vulgaris)) or bulgar)*.