Perhaps you should try some spelling variations:
decreased sperm » decreased sleep (Expand search)
sperm decrease » term decrease (Expand search), speed decrease (Expand search), speed decreases (Expand search)
decrease akt » decrease at (Expand search), decrease and (Expand search), decrease after (Expand search)
akt decrease » and decrease (Expand search), not decrease (Expand search), any decrease (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)
decrease il » decreased il (Expand search), decrease in (Expand search), decrease hiv (Expand search)
il object » ocl object (Expand search), gdl object (Expand search), final object (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: "(( decreased sperm decrease akt decrease ) OR ( decrease to decrease il object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreased sperm decrease akt decrease ) OR ( decrease to decrease il object ))*.