Perhaps you should try some spelling variations:
decreases sperm » decreased sperm (Expand search), decreases serum (Expand search), decreasing sperm (Expand search)
sperm decrease » term decrease (Expand search), speed decrease (Expand search), speed decreases (Expand search)
the involving » case involving (Expand search), game involving (Expand search), the involved (Expand search)
decrease toc » decrease of (Expand search), decreased to (Expand search), decrease or (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not decrease (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (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)

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: "(( decreases sperm decrease toc decrease ) OR ( decrease on decrease the involving ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreases sperm decrease toc decrease ) OR ( decrease on decrease the involving ))*.