Perhaps you should try some spelling variations:
processes effects » process effects (Expand search), processing effects (Expand search), process effect (Expand search)
decay processes » levy processes (Expand search), memory processes (Expand search), decay properties (Expand search)
decrease akt » decrease at (Expand search), decrease after (Expand search), decrease with (Expand search)
akt decrease » and decrease (Expand search), not decrease (Expand search), any decrease (Expand search)
decrease spp » decrease sod (Expand search), decrease std (Expand search), decrease soon (Expand search)
spp decrease » spp increase (Expand search), speed decrease (Expand search), help decrease (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (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 akt decrease spp decrease ) OR ( decrease AND decay processes effects ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease akt decrease spp decrease ) OR ( decrease and decay processes effects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease akt decrease spp decrease ) OR ( decrease and decay processes effects ))*.