Perhaps you should try some spelling variations:
bulgaars » bulgare
bulgeriia » bulgariia, bulgaria, bulgarica
vulgaria » bulgaria, vulgari, vulvaria
vulgaris » bulgaria, vulgar
bulgar » bulgare, vulgar, bulger

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: ((bulgaars OR (bulgeriia OR (vulgaria OR vulgaris))) OR bulgar).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bulgaars or (bulgeriia or (vulgaria OR vulgaris))) or bulgar)".
• Adding a wildcard symbol may retrieve word variants: ((bulgaars or (bulgeriia or (vulgaria OR vulgaris))) or bulgar)*.