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