Perhaps you should try some spelling variations:
"de internationaal seminarie prize" » "de international seminar prize" (Expand Search), "de international solidarity prize" (Expand Search), "de international seminarie prize" (Expand Search), "het internationaal seminarie prize" (Expand Search), "de internationale 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"een internationale seminar prize\") OR (\"de internationaal seminarie prize\"))~".
• Removing quotes may allow a broader search: (( een internationale seminar prize ) OR ( de internationaal seminarie prize ))~.
• Adding a wildcard symbol may retrieve word variants: (("een internationale seminar prize") OR ("de internationaal seminarie prize"))*.