Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, bulgareiae, vulgariae, bulgeriae
vulgarische » bulgarische, bulgarischen, bulgarischer
bulgarians » bulgarian, bulgariens, bulgarien, bulgareians, vulgarians, bulgerians
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, bulger
vulgare » vulgar, vulgaris, vulgarly

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 (bulgarians OR bulgaria))) OR ((bulgar OR vulgare) OR bulge)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (vulgarische or (bulgarians or bulgaria))) or ((bulgar or vulgare) or bulge))*.