Perhaps you should try some spelling variations:
internationale meeting » international meeting (Expand Search), internationale samenwerking (Expand Search)
internationaal seminar » international seminar (Expand Search), internationaal seminarie (Expand Search), internationaal verdrag (Expand Search)
het internationaal » _ international (Expand Search)
de internationale » _ international (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 meeting prize ) OR ( het internationaal seminar prize ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( de internationale meeting prize ) OR ( het internationaal seminar prize ))".
• Adding a wildcard symbol may retrieve word variants: (( de internationale meeting prize ) OR ( het internationaal seminar prize ))*.