Perhaps you should try some spelling variations:
based processes » based process (Expand search), and processes (Expand search)
decrease root » decrease food (Expand search), decrease soon (Expand search), decreasing root (Expand search)
disease based » disease caused (Expand search), disease case (Expand search), diseases caused (Expand search)
piston python » piton python (Expand search), pitons python (Expand search), python python (Expand search)
root disease » root diseases (Expand search), rot disease (Expand search), foot disease (Expand search)
python and » python based (Expand search)
and piston » and pigeon (Expand search), and gaston (Expand search), and pinion (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 root disease based processes ) OR ( python AND piston python programming ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease root disease based processes ) OR ( python and piston python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease root disease based processes ) OR ( python and piston python programming ))*.