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