Perhaps you should try some spelling variations:
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
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)
during pellets » using pellets (Expand search), reducing pellets (Expand search), during pollen (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain 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 to decrease ) OR ( decrease in decrease during pellets ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreases sperm decrease to decrease ) OR ( decrease in decrease during pellets ))*.