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