Perhaps you should try some spelling variations:
decreased sperm » decreased sleep (Expand search)
peace processes » peace process (Expand search), surface processes (Expand search), change processes (Expand search)
sperm decrease » term decrease (Expand search), speed decrease (Expand search), speed decreases (Expand search)
decrease peace » decrease fear (Expand search), decrease age (Expand search), decrease release (Expand search)
methods python » methods action (Expand search), pythons python (Expand search), methods method (Expand search)
python and » python based (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: (( decreased sperm decrease peace processes ) OR ( python AND methods python programming ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decreased sperm decrease peace processes ) OR ( python and methods python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreased sperm decrease peace processes ) OR ( python and methods python programming ))*.