Perhaps you should try some spelling variations:
validation programming » evaluation programming (Expand search), application programming (Expand search), applications programming (Expand search)
decrease processes » disease processes (Expand search), defense processes (Expand search), decay processes (Expand search)
decrease decrease » decrease release (Expand search), disease decreases (Expand search), decrease sucrose (Expand search)
decrease rate » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
rate decrease » rats decreases (Expand search), ratio decrease (Expand search), rate increase (Expand search)
python api » python and (Expand search)
api method » iapi method (Expand search), bpi method (Expand search), epi method (Expand search)

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