Perhaps you should try some spelling variations:
"de internationale seminar prize" » "de international seminar prize" (Expand Search), "de internationaal seminarie prize" (Expand Search), "de internationale meeting prize" (Expand Search), "_ international seminar prize" (Expand Search)
"en internationale de prize" » "_ international de prize" (Expand Search), "het internationaal de prize" (Expand Search), "eerste internationale de prize" (Expand Search), "en internationale des prize" (Expand Search), "en international de prize" (Expand Search), "en internationale de prijzen" (Expand Search), "en internationale de prince" (Expand Search), "en internationale de prijs" (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: "((\"en internationale de prize\") OR (\"de internationale seminar prize\"))~".
• Removing quotes may allow a broader search: (( en internationale de prize ) OR ( de internationale seminar prize ))~.
• Adding a wildcard symbol may retrieve word variants: (("en internationale de prize") OR ("de internationale seminar prize"))*.