Perhaps you should try some spelling variations:
"het internationaal seminarie prize" » "het international seminar prize" (Expand Search), "het international solidarity prize" (Expand Search), "_ international seminarie prize" (Expand Search), "de internationale seminarie prize" (Expand Search)
"en internationale de prins" » "de internationale de prins" (Expand Search), "_ international de prins" (Expand Search), "eerste internationale de prins" (Expand Search), "en internationale des prins" (Expand Search), "en international de prins" (Expand Search), "en internationale de prijs" (Expand Search), "en internationale 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: (("en internationale de prins") OR ("het internationaal seminarie prize"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"en internationale de prins\") OR (\"het internationaal seminarie prize\"))*".
• Removing quotes may allow a broader search: (( en internationale de prins ) OR ( het internationaal seminarie prize ))*.