Perhaps you should try some spelling variations:
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
during decrease » during increased (Expand search), during depressed (Expand search), taping decrease (Expand search)
decreases sperm » decreased sperm (Expand search), decreases serum (Expand search), decreasing sperm (Expand search)
sperm matters » speed matters (Expand search), sperm after (Expand search)
in decreases » in decreased (Expand search), and decreases (Expand search), ivm decreases (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), to 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: "(( decrease of decrease during decrease ) OR ( decrease in decreases sperm matters ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease of decrease during decrease ) OR ( decrease in decreases sperm matters ))*.