Perhaps you should try some spelling variations:
internationaal seminarie » international seminar (Expand Search), international solidarity (Expand Search)
internationale dag » internationale des (Expand Search), internationale de (Expand Search), international de (Expand Search)
de internationale » _ international (Expand Search)
et internationaal » het internationaal (Expand Search), et internationale (Expand Search), het interationaal (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: (( de internationale dag prize ) OR ( et internationaal seminarie prize ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( de internationale dag prize ) OR ( et internationaal seminarie prize ))*".