Perhaps you should try some spelling variations:
"het internationaal seminar prize" » "het internationaal seminarie prize" (Expand Search), "het internationaal verdrag prize" (Expand Search), "het internationaal meeting prize" (Expand Search), "_ international seminar prize" (Expand Search), "de internationale seminar prize" (Expand Search)
"halen international seminar prize" » "halen international women's prize" (Expand Search), "halen international solidarity prize" (Expand Search), "halen internationale seminar prize" (Expand Search), "en internationale seminar prize" (Expand Search), "de international 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 ("halen international seminar prize"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"het internationaal seminar prize\") OR (\"halen international seminar prize\"))".
• Removing quotes may allow a broader search: (( het internationaal seminar prize ) OR ( halen international seminar prize )).
• Adding a wildcard symbol may retrieve word variants: (("het internationaal seminar prize") OR ("halen international seminar prize"))*.