Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarie, bulgarians, bulgareiae, vulgariae, bulgeriae
bulgarian » hungarian, bulgareian, vulgarian, bulgerian
bulgerian » bulgarians, eulerian, algerian
bulgaria » bulgareia, vulgaria, bulgeria
bulgarien » bulgareien, vulgarien, bulgerien
bulgar » bulgare, vulgar, bulger
bulges » bulge

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 ((bulgarian OR (bulgerian OR bulgaria)) OR bulgarien)) OR (bulgar OR bulges)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bulgariae or ((bulgarian or (bulgerian OR bulgaria)) or bulgarien)) or (bulgar or bulges))".
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or ((bulgarian or (bulgerian OR bulgaria)) or bulgarien)) or (bulgar or bulges))*.