Perhaps you should try some spelling variations:
bulgaricae » bulgarica, bulgarian, bulgarie
bulgarische » bulgarischen, ungarische
vulgaria » vulgaris, vulgari, vulvaria
bulgere » bulgare, bulger, bilgere

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: (((bulgaricae OR bulgarische) OR (bulgaria OR vulgaria)) OR ((vulgar OR bulge) OR bulgere)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((bulgaricae OR bulgarische) or (bulgaria or vulgaria)) or ((vulgar or bulge) or bulgere))".
• Adding a wildcard symbol may retrieve word variants: (((bulgaricae OR bulgarische) or (bulgaria or vulgaria)) or ((vulgar or bulge) or bulgere))*.