Perhaps you should try some spelling variations:
decrease blowing » decrease owing (Expand search), decrease following (Expand search), decrease flooding (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)
blowing agent » blocking agent (Expand search), blocking agents (Expand search), coloring agent (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: "(( decrease NOT decreases sperm decrease ) OR ( decrease OR decrease blowing agent ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease NOT decreases sperm decrease ) OR ( decrease OR decrease blowing agent ))*.