Perhaps you should try some spelling variations:
"vakbond/metaalbewerkers | syndicale/métallurgistes" » "vakbonden/metaalbewerkers | syndicale/métallurgistes", "vakbond/metaalbewerkers | syndicale/mémetallurgistes"
"vakbond/metaalbewerkers | syndicaat/métallurgistes" » "vakbonden/metaalbewerkers | syndicaat/métallurgistes", "vakbond/metaalbewerkers | syndicaat/mémetallurgistes"

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: (("vakbond/metaalbewerkers | syndicale/métallurgistes") OR ("vakbond/metaalbewerkers | syndicaat/métallurgistes"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"vakbond/metaalbewerkers | syndicale/métallurgistes\") OR (\"vakbond/metaalbewerkers | syndicaat/métallurgistes\"))".
• Removing quotes may allow a broader search: (( vakbond/metaalbewerkers | syndicale/métallurgistes ) OR ( vakbond/metaalbewerkers | syndicaat/métallurgistes )).
• Adding a wildcard symbol may retrieve word variants: (("vakbond/metaalbewerkers | syndicale/métallurgistes") OR ("vakbond/metaalbewerkers | syndicaat/métallurgistes"))*.