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