Perhaps you should try some spelling variations:
des nationalen » die nationalen (Expand Search), als nationale (Expand Search), die nationale (Expand Search)
der nationale » die nationale (Expand Search), die nationalen (Expand Search), als nationale (Expand Search)
bulgare » bulgaren (Expand Search), bulgarien (Expand Search)
cour » our (Expand Search), four (Expand Search), pour (Expand Search)
societa » society (Expand Search), societe (Expand Search)
societats » societyts (Expand Search), societets (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: union bulgare cour la paix et cour la (societa OR societats) ((des nationalen) OR (der nationale))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "union bulgare cour la paix et cour la (societa OR societats) ((des nationalen) OR (der nationale))*".