Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, bulgareiae, vulgariae, bulgeriae
vulgaria » bulgaria, vulgaris, vulgari
bulgariaisch » bulgarisch, bulgarians, bulgareiaisch, vulgariaisch, bulgeriaisch
bulgarische » bulgarischen, ungarische, bulgareische, vulgarische, bulgerische
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 (vulgaria OR (bulgariaisch OR bulgarische))) OR (bulgar OR bulge)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bulgariae or (vulgaria or (bulgariaisch OR bulgarische))) or (bulgar or bulge))".
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (vulgaria or (bulgariaisch OR bulgarische))) or (bulgar or bulge))*.