Perhaps you should try some spelling variations:
"_ internationaal verdragie prize" » "_ internationaal verdrag prize" (Expand Search), "_ internationaal seminarie prize" (Expand Search), "_ international verdragie prize" (Expand Search), "de international verdragie prize" (Expand Search), "de internationale verdragie 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("het internationaal seminar prize") OR ("_ internationaal verdragie prize"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"het internationaal seminar prize\") OR (\"_ internationaal verdragie prize\"))*".
• Removing quotes may allow a broader search: (( het internationaal seminar prize ) OR ( _ internationaal verdragie prize ))*.