Perhaps you should try some spelling variations:
vulgareiae » bulgariae, vulgarise, vulgariae, vulgarisiae, vulgarlyiae
bulgare » bulgarien, vulgares
vulgare » vulgar, vulgaris, vulgarly
bulgarie » bulgarien, bulgarian, vulgaris

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