Perhaps you should try some spelling variations:
based processes » based process (Expand search), and processes (Expand search)
decrease spot » decrease sod (Expand search), decrease soon (Expand search), decrease of (Expand search)
disease based » disease caused (Expand search), disease case (Expand search), diseases caused (Expand search)
spot disease » host disease (Expand search), wilt disease (Expand search)
python 2a » python _ (Expand search), python c (Expand search), python to (Expand search)
2a pitons » _ pitons (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 spot disease based processes ) OR ( python 2a pitons python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease spot disease based processes ) OR ( python 2a pitons python programming ))*.