Perhaps you should try some spelling variations:
vulgaricae » bulgaricae, bulgarica, bulgariae
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, bulger
vulgare » vulgar, vulgaris, vulgarly
bulgere » bulgare, bulger, burgere
bilgere » bilger, bilgeri, billigere

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