Perhaps you should try some spelling variations:
decrease retrieval » decrease striatal (Expand search), dense retrieval (Expand search), database retrieval (Expand search)
retrieval process » retrieval models (Expand search), removal process (Expand search)
that decrease » that increase (Expand search), that increases (Expand search), not decrease (Expand search)
decrees that » devices that (Expand search), trees that (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)
on decrease » on decreased (Expand search), of decrease (Expand search), or decrease (Expand search)
decrease at » decrease akt (Expand search), decrease and (Expand search), decrease in (Expand search)
at decrease » rate decrease (Expand search), and decrease (Expand search), not decrease (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease on decrease retrieval process ) OR ( decrees that decrease at decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease on decrease retrieval process ) OR ( decrees that decrease at decrease ))*.