Perhaps you should try some spelling variations:
decrease fear » decreased fear (Expand search), decrease fetal (Expand search), decreased heart (Expand search)
fear affected » year affected (Expand search), heart affected (Expand search), heat affected (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 the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the decrease » to decrease (Expand search), and decrease (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
not decrease » to decrease (Expand search), not increase (Expand search), and 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 spp decrease the decrease ) OR ( decrease NOT decrease fear affected ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease spp decrease the decrease ) OR ( decrease not decrease fear affected ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease spp decrease the decrease ) OR ( decrease not decrease fear affected ))*.