Perhaps you should try some spelling variations:
"algemene staking van 1993" » "algemene staking van 1995" (Expand Search), "algemene staking van 1093" (Expand Search), "algemene staking van 1893" (Expand Search), "algemene staking van 1793" (Expand Search)
"algemene staking van 19" » "algemene staking van 10" (Expand Search), "algemene staking van 18" (Expand Search), "algemene staking van 17" (Expand Search)
"algemene werking van 19" » "algemene werking van 10" (Expand Search), "algemene werking van 18" (Expand Search), "algemene werking van 17" (Expand Search)
"algemene werking van 11" » "algemene werking van 10" (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 staking van 1993") OR ((("algemene staking van 19") OR ((("algemene werking van 19") OR ("algemene werking van 11"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"algemene staking van 1993\") OR (((\"algemene staking van 19\") OR (((\"algemene werking van 19\") OR (\"algemene werking van 11\"))))))".
• Removing quotes may allow a broader search: (( algemene staking van 1993 ) OR ((( algemene staking van 19 ) OR ((( algemene werking van 19 ) OR ( algemene werking van 11 )))))).
• Adding a wildcard symbol may retrieve word variants: (("algemene staking van 1993") OR ((("algemene staking van 19") OR ((("algemene werking van 19") OR ("algemene werking van 11"))))))*.