Perhaps you should try some spelling variations:
decreases sperm » decreased sperm (Expand search), decreases serum (Expand search), decreasing sperm (Expand search)
decrease penal » decrease renal (Expand search), decreased renal (Expand search), decreases renal (Expand search)
sperm decrease » term decrease (Expand search), speed decrease (Expand search), speed decreases (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
to decreases » to decrease (Expand search), to decreased (Expand search), co2 decreases (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (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 AND decrease penal projeto ) OR ( decrease to decreases sperm decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and decrease penal projeto ) OR ( decrease to decreases sperm decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and decrease penal projeto ) OR ( decrease to decreases sperm decrease ))*.