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