Perhaps you should try some spelling variations:
"algemene werking van 1913" » "algemene werking van 11" (Expand Search), "algemene werking van 19" (Expand Search), "algemene werking van 1995" (Expand Search)
"algemene staking van 1993" » "algemene staking van 1995" (Expand Search), "algemene staking van 19" (Expand Search)
"algemene staking van 18" » "algemene staking van 11" (Expand Search)

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: (((((("algemene werking van 1913") OR ("algemene staking van 1993"))) OR ("algemene staking van 10"))) OR ("algemene staking van 18"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"algemene werking van 1913\") OR (\"algemene staking van 1993\"))) OR (\"algemene staking van 10\"))) OR (\"algemene staking van 18\"))".
• Removing quotes may allow a broader search: (((((( algemene werking van 1913 ) OR ( algemene staking van 1993 ))) OR ( algemene staking van 10 ))) OR ( algemene staking van 18 )).
• Adding a wildcard symbol may retrieve word variants: (((((("algemene werking van 1913") OR ("algemene staking van 1993"))) OR ("algemene staking van 10"))) OR ("algemene staking van 18"))*.