Perhaps you should try some spelling variations:
venation patterns » vegetation patterns (Expand search), defecation patterns (Expand search), migration patterns (Expand search)
decrease venation » decrease predation (Expand search), decrease prevention (Expand search), decrease migration (Expand search)
decrease speed » decrease need (Expand search), decreased sperm (Expand search), decreases sperm (Expand search)
speed decrease » speed decreases (Expand search), spread decreased (Expand search), stent decrease (Expand search)
decrease and » decreases and (Expand search), decrease of (Expand search), decrease the (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (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: (( decrease AND decrease speed decrease ) OR ( decrease in decrease venation patterns ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and decrease speed decrease ) OR ( decrease in decrease venation patterns ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and decrease speed decrease ) OR ( decrease in decrease venation patterns ))*.