Perhaps you should try some spelling variations:
"et internationaal seminarie prize" » "et international seminar prize" (Expand Search), "et international solidarity prize" (Expand Search), "het internationaal seminarie prize" (Expand Search), "et internationale seminarie prize" (Expand Search), "het interationaal seminarie prize" (Expand Search)
"een internationale seminar prize" » "een international seminar prize" (Expand Search), "een internationale meeting prize" (Expand Search), "een internationale mars prize" (Expand Search), "en internationale seminar prize" (Expand Search), "de internationale seminar prize" (Expand Search), "de international seminar prize" (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: (("et internationaal seminarie prize") OR ("een internationale seminar prize"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"et internationaal seminarie prize\") OR (\"een internationale seminar prize\"))".
• Removing quotes may allow a broader search: (( et internationaal seminarie prize ) OR ( een internationale seminar prize )).
• Adding a wildcard symbol may retrieve word variants: (("et internationaal seminarie prize") OR ("een internationale seminar prize"))*.