Perhaps you should try some spelling variations:
vulgariae » bulgariae, vulgarise, bulgaricae
bulgarien » bulgarian, bulgaria, bulgariaien, bulgarieien
bulgar » bulgaria, bulgarie
bulgare » bulgariae, bulgariee, bulgarie, vulgare, bulgaria
bulger » bulge, bulges

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: ((vulgariae OR bulgarien) OR (((bulgar OR vulgar) OR bulgare) OR bulger))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vulgariae or bulgarien) or (((bulgar OR vulgar) or bulgare) or bulger))*".