Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarians, bulgare
bulgarie » vulgaris, vulgare
bulgarien » vulgarisn, vulgaren
bulgarian » hungarian
bulger » bulges

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