Perhaps you should try some spelling variations:
"en internationale solidarity prize" » "en international solidarity prize" (Expand Search), "en internationale politiek prize" (Expand Search), "de internationale solidarity prize" (Expand Search), "_ international solidarity prize" (Expand Search), "eerste internationale solidarity prize" (Expand Search)
"het internationaal seminar prize" » "het international seminar prize" (Expand Search), "het internationaal seminarie prize" (Expand Search), "het internationaal verdrag prize" (Expand Search), "_ international seminar prize" (Expand Search), "de internationale seminar prize" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"het internationaal seminar prize\") OR (\"en internationale solidarity prize\"))~".
• Removing quotes may allow a broader search: (( het internationaal seminar prize ) OR ( en internationale solidarity prize ))~.
• Adding a wildcard symbol may retrieve word variants: (("het internationaal seminar prize") OR ("en internationale solidarity prize"))*.