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