Perhaps you should try some spelling variations:
"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)
"het eerste internationale dour festival" » "het eerste internationale des festival" (Expand Search), "het eerste internationale de festival" (Expand Search), "het eerste internationale dag festival" (Expand Search), "de eerste internationale dour festival" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"het eerste internationale dour festival\") OR (\"en de internationale blues festival\"))~".
• Removing quotes may allow a broader search: (( het eerste internationale dour festival ) OR ( en de internationale blues festival ))~.
• Adding a wildcard symbol may retrieve word variants: (("het eerste internationale dour festival") OR ("en de internationale blues festival"))*.