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