Perhaps you should try some spelling variations:
decrease ratio » decreased ratio (Expand search), decrease at (Expand search), decreased rate (Expand search)
ratio decrease » to decrease (Expand search), rats decreases (Expand search)
vpython python » python python (Expand search), pythons python (Expand search), piton python (Expand search)
c programming » _ programming (Expand search), cone programming (Expand search), and programming (Expand search)
code vpython » 3d vpython (Expand search)
python code » python coding (Expand search), python redes (Expand search)
decrease c » decrease _ (Expand search), decrease β (Expand search), decrease toc (Expand search)

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

• Removing quotes may allow a broader search: (( decrease ratio decrease c programming ) OR ( python code vpython python programming ))~.