Perhaps you should try some spelling variations:
internationale conferentie » international conference (Expand Search)
rencontre internationale » eerste internationale (Expand Search)
voor internationale » de internationale (Expand Search), en internationale (Expand Search), journee internationale (Expand Search)
conferentie de » conference de (Expand Search), conferentie _ (Expand Search), conferentie over (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: bureau permanent de rencontre internationale conferentie de voor internationale,~.
• Adding a wildcard symbol may retrieve word variants: bureau permanent de rencontre internationale conferentie de voor internationale,*.