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