Perhaps you should try some spelling variations:
decrease theory » decrease their (Expand search), decrease the (Expand search), decreased memory (Expand search)
base processing » based processing (Expand search), waste processing (Expand search), laser processing (Expand search)
theory decrease » the decrease (Expand search), therapy decreases (Expand search), memory decreases (Expand search)
decreased base » decreased bone (Expand search), decreased brain (Expand search), decreased risk (Expand search)
not decreased » not decrease (Expand search), to decreased (Expand search), not increased (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not 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 NOT decreased base processing ) OR ( decrease toc decrease theory decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease not decreased base processing ) OR ( decrease toc decrease theory decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease not decreased base processing ) OR ( decrease toc decrease theory decrease ))*.