Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarie, bulgarien, bulgareiae, vulgariae, bulgeriae
bulgarians » bulgariens, bulgarien, hungarians, bulgareians, vulgarians, bulgerians
bulgarian » hungarian, bulgareian, vulgarian, bulgerian
bulgarische » bulgarischen, ungarische, bulgareische, vulgarische, bulgerische
vulgaria » vulgaris, vulgari, vulvaria
bulgaria » bulgareia, vulgaria, bulgeria
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 bulgarians) OR bulgarian) OR (bulgarische OR (bulgaria OR vulgaria))) OR (bulgar OR bulge)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((bulgariae OR bulgarians) or bulgarian) or (bulgarische or (bulgaria or vulgaria))) or (bulgar or bulge))".
• Adding a wildcard symbol may retrieve word variants: ((((bulgariae OR bulgarians) or bulgarian) or (bulgarische or (bulgaria or vulgaria))) or (bulgar or bulge))*.