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