Perhaps you should try some spelling variations:
decreased sperm » decreased sleep (Expand search)
crime processes » time processes (Expand search), care processes (Expand search), agile processes (Expand search)
sperm decrease » term decrease (Expand search), speed decrease (Expand search), speed decreases (Expand search)
decrease crime » decrease risk (Expand search), decreased time (Expand search), decrease overtime (Expand search)
piton python » pitons python (Expand search), in python (Expand search), with python (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decreased sperm decrease crime processes ) OR ( python AND piton python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decreased sperm decrease crime processes ) OR ( python AND piton python programming ))*.