Perhaps you should try some spelling variations:
"het international seminar prize" » "het international women's prize" (Expand Search), "het international solidarity prize" (Expand Search), "het internationaal seminar prize" (Expand Search), "de international seminar prize" (Expand Search), "et internationale seminar prize" (Expand Search)
"het internationale de prijzen" » "de internationale de prijzen" (Expand Search), "het internationaal de prijzen" (Expand Search), "en internationale de prijzen" (Expand Search), "het internationale des prijzen" (Expand Search), "het international de prijzen" (Expand Search), "het internationaale de prijzen" (Expand Search), "et internationalee de prijzen" (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 internationale de prijzen") OR ("het international seminar prize"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"het internationale de prijzen\") OR (\"het international seminar prize\"))*".
• Removing quotes may allow a broader search: (( het internationale de prijzen ) OR ( het international seminar prize ))*.