Perhaps you should try some spelling variations:
internationaal seminarie » international seminar (Expand Search), international solidarity (Expand Search)
internationale mars » internationale des (Expand Search), internationale dag (Expand Search), internationale de (Expand Search)
het internationaal » _ international (Expand Search), de internationale (Expand Search)
en internationale » de internationale (Expand Search), _ international (Expand Search), eerste internationale (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: "(( en internationale mars prize ) OR ( het internationaal seminarie prize ))~".
• Adding a wildcard symbol may retrieve word variants: (( en internationale mars prize ) OR ( het internationaal seminarie prize ))*.