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)
decrease ratio » decreased ratio (Expand search), decreased rate (Expand search), decreases rate (Expand search)
ratio decrease » rate decrease (Expand search), rapid decrease (Expand search), ratio increase (Expand search)
at processing » meat processing (Expand search), heat processing (Expand search), wet processing (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the decrease » to decrease (Expand search), and decrease (Expand search), _ decrease (Expand search)
decrease at » decrease akt (Expand search), decrease and (Expand search), decrease in (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 at processing ) OR ( decrease the decrease ratio decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreases sperm decrease at processing ) OR ( decrease the decrease ratio decrease ))*.