Perhaps you should try some spelling variations:
"BWP/commissies/vakbond | POB/commissions/syndicale" » "BWP/commissie/vakbond | POB/commissions/syndicale"
"BWP/commissies/vakbond | POB/commissions/syndicaat" » "BWP/commissie/vakbond | POB/commissions/syndicaat"
"BWP/commissies/vakbonden | POB/commissions/syndicat" » "BWP/commissie/vakbonden | POB/commissions/syndicat", "BWP/commissies/vakbonden | POB/commissions/syndicats"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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