Perhaps you should try some spelling variations:
bulgarie » bulgarian, vulgare
bulgarien » bulgariann, vulgaren, bulgarian
vulgaris » vulgar
billigen » billiger, billion, billig
bulger » bulge, 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: (((((bulgarie OR vulgaris) OR bulgaria) OR bulgarien) OR billigen) OR bulger).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((bulgarie OR vulgaris) or bulgaria) or bulgarien) or billigen) or bulger)".
• Adding a wildcard symbol may retrieve word variants: (((((bulgarie OR vulgaris) or bulgaria) or bulgarien) or billigen) or bulger)*.