Perhaps you should try some spelling variations:
"algemene werking van 1993" » "algemene werking van 1995" (Expand Search), "algemene werking van 1093" (Expand Search), "algemene werking van 1193" (Expand Search), "algemene werking van 1893" (Expand Search)
"algemene staking van 1895" » "algemene staking van 1995" (Expand Search), "algemene staking van 18" (Expand Search), "algemene staking van 15" (Expand Search)
"algemene staking van 19" » "algemene staking van 10" (Expand Search), "algemene staking van 11" (Expand Search), "algemene staking van 18" (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 1993") OR ("algemene staking van 19"))) OR ("algemene staking van 1895"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"algemene werking van 1993\") OR (\"algemene staking van 19\"))) OR (\"algemene staking van 1895\"))".
• Removing quotes may allow a broader search: (((( algemene werking van 1993 ) OR ( algemene staking van 19 ))) OR ( algemene staking van 1895 )).
• Adding a wildcard symbol may retrieve word variants: (((("algemene werking van 1993") OR ("algemene staking van 19"))) OR ("algemene staking van 1895"))*.