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), "_ internationale seminar prize" (Expand Search), "het internationaale seminar prize" (Expand Search), "en internationalee seminar prize" (Expand Search)
"de international des prize" » "de internationale des prize" (Expand Search), "de international de prize" (Expand Search), "de internationale de prize" (Expand Search), "_ international des prize" (Expand Search), "het internationaal des prize" (Expand Search), "en internationale des 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: "((\"de international des prize\") OR (\"de internationale seminar prize\"))~".
• Removing quotes may allow a broader search: (( de international des prize ) OR ( de internationale seminar prize ))~.
• Adding a wildcard symbol may retrieve word variants: (("de international des prize") OR ("de internationale seminar prize"))*.