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