Perhaps you should try some spelling variations:
and reprocessing » and geoprocessing (Expand search), and processing (Expand search), data preprocessing (Expand search)
decrease covid » increase covid (Expand search), increased covid (Expand search), disease covid (Expand search)
covid decrease » rapid decrease (Expand search), soil decrease (Expand search), via decrease (Expand search)
decrease and » decreases and (Expand search), decrease of (Expand search), decrease the (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (Expand search)

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease covid decrease AND reprocessing ) OR ( decrease _ decrease in decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease covid decrease and reprocessing ) OR ( decrease _ decrease in decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease covid decrease and reprocessing ) OR ( decrease _ decrease in decrease ))*.