Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, bulgareiae, vulgariae, bulgeriae
bulgarians » bulgarian, bulgariens, bulgarien, bulgareians, vulgarians, bulgerians
bulgerian » bulgarian, eulerian, bulgarien
bulgarische » bulgarischen, ungarische, bulgareische, vulgarische, bulgerische
vulgaria » vulgaris, vulgari, vulvaria
bulgaria » bulgareia, vulgaria, bulgeria
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: ((((bulgariae OR bulgarians) OR bulgerian) OR (bulgarische OR (bulgaria OR vulgaria))) OR (bulgar OR bulge)).
• Adding a wildcard symbol may retrieve word variants: ((((bulgariae or bulgarians) or bulgerian) or (bulgarische or (bulgaria or vulgaria))) or (bulgar or bulge))*.