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

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 bulgarie) OR bulgare) OR bulge)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bulgariae or (vulgarische or (bulgarians or bulgaria))) or (((bulgar OR bulgarie) or bulgare) or bulge))".
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (vulgarische or (bulgarians or bulgaria))) or (((bulgar OR bulgarie) or bulgare) or bulge))*.