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