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