Perhaps you should try some spelling variations:
"het internationaale seminar prize" » "het international seminar prize" (Expand Search), "het internationaal seminarie prize" (Expand Search), "het internationaal seminar prize" (Expand Search), "et internationale seminar prize" (Expand Search), "het interationaal seminar prize" (Expand Search)
"de international seminarie prize" » "de internationaal seminarie prize" (Expand Search), "de international seminar prize" (Expand Search), "de international solidarity prize" (Expand Search), "de internationale seminarie prize" (Expand Search), "_ international seminarie prize" (Expand Search), "het internationaal seminarie prize" (Expand Search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"het internationaale seminar prize\") OR (\"de international seminarie prize\"))~".
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