Perhaps you should try some spelling variations:
"het eerste internationale contre festival" » "het eerste internationale politiek festival" (Expand Search), "het eerste internationale conferentie festival" (Expand Search), "het eerste internationale de festival" (Expand Search), "de eerste internationale contre festival" (Expand Search)
"en de internationale blues festival" » "en de internationale des festival" (Expand Search), "en de internationale belge festival" (Expand Search), "en de internationale de festival" (Expand Search), "en _ international blues festival" (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: (("het eerste internationale contre festival") OR ("en de internationale blues festival"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"het eerste internationale contre festival\") OR (\"en de internationale blues festival\"))*".
• Removing quotes may allow a broader search: (( het eerste internationale contre festival ) OR ( en de internationale blues festival ))*.