Perhaps you should try some spelling variations:
decrease rapidly » disease rapidly (Expand search), decrease lipid (Expand search)
rapidly decrease » rapid decrease (Expand search), rapid increase (Expand search), taping decrease (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)
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
their process » their processes (Expand search), their processing (Expand search), their problems (Expand search)
decrease of » decrease in (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: "(( decreases sperm decrease their process ) OR ( decrease rapidly decrease of decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreases sperm decrease their process ) OR ( decrease rapidly decrease of decrease ))*.