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 prince" » "_ international de prince" (Expand Search), "de internationale des prince" (Expand Search), "de international de prince" (Expand Search), "de internationale le prince" (Expand Search), "de internationale de prins" (Expand Search), "de internationale de provincie" (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 prince") OR ("een internationale seminar prize"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"de internationale de prince\") OR (\"een internationale seminar prize\"))*".
• Removing quotes may allow a broader search: (( de internationale de prince ) OR ( een internationale seminar prize ))*.