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