Perhaps you should try some spelling variations:
internationale seminar » international seminar (Expand Search), internationaal seminarie (Expand Search), internationale meeting (Expand Search)
et internationale » en internationale (Expand Search), een internationale (Expand Search), de internationale (Expand Search)
de international » de internationale (Expand Search), _ international (Expand Search), het internationaal (Expand Search)
de prince » le prince (Expand Search), de prins (Expand Search), de provincie (Expand Search)
de prize » de prijzen (Expand Search), de prijs (Expand Search), de prins (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 international ((de prize) OR (de prince)) ) OR ( et internationale seminar prize ))~".
• Adding a wildcard symbol may retrieve word variants: (( de international ((de prize) OR (de prince)) ) OR ( et internationale seminar prize ))*.