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