Perhaps you should try some spelling variations:
"internationale conferentie opposition" » "international conference opposition" (Expand Search)
"internationale d'ete opposition" » "internationale d'envoi opposition" (Expand Search), "internationale contre opposition" (Expand Search), "international de opposition" (Expand Search), "internationale de l'opposition" (Expand Search)
"internationale de opposition" » "international de opposition" (Expand Search), "internationale de l'opposition" (Expand Search)
"internationale des opposition" » "international des opposition" (Expand Search), "internationale de l'opposition" (Expand Search), "internationale des propositions" (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: (((("internationale conferentie opposition") OR ("internationale de opposition"))) OR ((("internationale d'ete opposition") OR ("internationale des opposition"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"internationale conferentie opposition\") OR (\"internationale de opposition\"))) OR (((\"internationale d'ete opposition\") OR (\"internationale des opposition\"))))*".
• Removing quotes may allow a broader search: (((( internationale conferentie opposition ) OR ( internationale de opposition ))) OR ((( internationale d'ete opposition ) OR ( internationale des opposition ))))*.