Perhaps you should try some spelling variations:
"vakbond/Internationaal Vakverbond | syndicaats/Union syndicale internationale" » "vakbond/Internationaal Vakverbond | syndicaat/Union syndicale internationale", "vakbond/Internationaal Vakverbond | syndicats/Union syndicale internationale"
"vakbonden/Internationaal Vakverbond | syndicat/Union syndicale internationale" » "vakbonden/Internationaal Vakverbond | syndicaat/Union syndicale internationale", "vakbonden/Internationaal Vakverbond | syndicats/Union syndicale internationale"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("vakbond/Internationaal Vakverbond | syndicaats/Union syndicale internationale") OR ("vakbonden/Internationaal Vakverbond | syndicat/Union syndicale internationale"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"vakbond/Internationaal Vakverbond | syndicaats/Union syndicale internationale\") OR (\"vakbonden/Internationaal Vakverbond | syndicat/Union syndicale internationale\"))".
• Removing quotes may allow a broader search: (( vakbond/Internationaal Vakverbond | syndicaats/Union syndicale internationale ) OR ( vakbonden/Internationaal Vakverbond | syndicat/Union syndicale internationale )).
• Adding a wildcard symbol may retrieve word variants: (("vakbond/Internationaal Vakverbond | syndicaats/Union syndicale internationale") OR ("vakbonden/Internationaal Vakverbond | syndicat/Union syndicale internationale"))*.

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