Perhaps you should try some spelling variations:
observed programming » oriented programming (Expand search), based programming (Expand search), bilevel programming (Expand search)
decrease observed » case observed (Expand search), decay observed (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)
data lambda » gama lambda (Expand search), iota lambda (Expand search), java lambda (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease rate decrease observed programming ) OR ( python data lambda python programming ))~.