Perhaps you should try some spelling variations:
bulgariae » bulgaria, bulgarian, bulgarians
bulgare » vulgare, bulgarien, bulgaria
bulgarie » bulgarien, bulgaria, bulgarian
bulgaricae » bulgarica, bulgarische, bulgaria

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