Perhaps you should try some spelling variations:
decreases sperm » decreased sperm (Expand search), decreases serum (Expand search), decreasing sperm (Expand search)
decrease ligand » decrease and (Expand search), decrease lipid (Expand search), decrease lodging (Expand search)
ligand decrease » and decrease (Expand search), ligand release (Expand search), ligands increased (Expand search)
sperm decrease » term decrease (Expand search), speed decrease (Expand search), speed decreases (Expand search)
in decreases » in decreased (Expand search), and decreases (Expand search), ivm decreases (Expand search)
decrease at » decrease akt (Expand search), decrease and (Expand search), decrease of (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 in decreases sperm decrease ) OR ( decrease ligand decrease at basic ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease in decreases sperm decrease ) OR ( decrease ligand decrease at basic ))*.