Perhaps you should try some spelling variations:
"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 international seminar prize" (Expand Search), "eerste internationale seminar prize" (Expand Search)
"de internationale de prize" » "_ international de prize" (Expand Search), "de internationale des prize" (Expand Search), "de international de prize" (Expand Search), "de internationale de prijzen" (Expand Search), "de internationale de prince" (Expand Search), "de internationale de prijs" (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 de prize") OR ("een internationale seminar prize"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"de internationale de prize\") OR (\"een internationale seminar prize\"))*".
• Removing quotes may allow a broader search: (( de internationale de prize ) OR ( een internationale seminar prize ))*.