Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarie
bulgarian » bulgaria, hungarian
bulgerian » bulgarians, bulgaria, eulerian
bulgarica » bulgaria, bulgarisch, bulgarien
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 bulgarica)) OR (vulgar OR bulges)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((bulgariae OR bulgarian) or (bulgerian or bulgarica)) or (vulgar or bulges))".
• Adding a wildcard symbol may retrieve word variants: (((bulgariae OR bulgarian) or (bulgerian or bulgarica)) or (vulgar or bulges))*.