Perhaps you should try some spelling variations:
"internationale conferentie opposition" » "international conference opposition" (Expand Search)
"internationale d'ete opposition" » "internationale des opposition" (Expand Search), "internationale d'envoi opposition" (Expand Search), "internationale contre opposition" (Expand Search), "internationale de l'opposition" (Expand Search)
"internationale de opposition" » "internationale des opposition" (Expand Search), "international de opposition" (Expand Search), "internationale de l'opposition" (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: "((((\"internationale conferentie opposition\") OR (\"internationale d'ete opposition\"))) OR (\"internationale de opposition\"))~".
• Removing quotes may allow a broader search: (((( internationale conferentie opposition ) OR ( internationale d'ete opposition ))) OR ( internationale de opposition ))~.
• Adding a wildcard symbol may retrieve word variants: (((("internationale conferentie opposition") OR ("internationale d'ete opposition"))) OR ("internationale de opposition"))*.