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 milk » decrease il (Expand search), decrease risk (Expand search), decrease in (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
not decrease » not increase (Expand search), and decrease (Expand search), the decrease (Expand search)
milk subject » risk subjects (Expand search), child subject (Expand search), milk project (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: (( decreases sperm decrease NOT decrease ) OR ( decrease to decrease milk subject ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decreases sperm decrease not decrease ) OR ( decrease to decrease milk subject ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreases sperm decrease not decrease ) OR ( decrease to decrease milk subject ))*.