Perhaps you should try some spelling variations:
"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), "_ internationale seminar prize" (Expand Search), "het internationaale seminar prize" (Expand Search), "en internationalee seminar prize" (Expand Search)
"de international meeting prize" » "de international seminar prize" (Expand Search), "_ international meeting prize" (Expand Search), "het internationaal meeting prize" (Expand Search), "en internationale meeting 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: "((\"de internationale seminar prize\") OR (\"de international meeting prize\"))~".
• Removing quotes may allow a broader search: (( de internationale seminar prize ) OR ( de international meeting prize ))~.
• Adding a wildcard symbol may retrieve word variants: (("de internationale seminar prize") OR ("de international meeting prize"))*.