Perhaps you should try some spelling variations:
decrease observed » case observed (Expand search), decay observed (Expand search)
observed programs » observer program (Expand search), oriented programs (Expand search), seed programs (Expand search)
python xcode » python code (Expand search), python cuda (Expand search)
decrease of » decrease in (Expand search)
of decrease » not decrease (Expand search), to decrease (Expand search), of decree (Expand search)
xcode java » codes java (Expand search)

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

• Removing quotes may allow a broader search: (( decrease of decrease observed programs ) OR ( python xcode java python programming ))~.