Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, bulgareiae, vulgariae, bulgeriae
vulgarische » bulgarische, bulgarischen, bulgarischer
bulgarien » bulgarian, bulgareien, vulgarien, bulgerien
bulgariens » bulgarians, bulgareiens, vulgariens, bulgeriens, bulgarian, bulgarie
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 (vulgarische OR (bulgarien OR bulgaria))) OR ((bulgar OR bulgariens) OR bulge)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (vulgarische or (bulgarien or bulgaria))) or ((bulgar or bulgariens) or bulge))*.