Perhaps you should try some spelling variations:
purchase programme » purchase program (Expand search), purchase programs (Expand search)
decrease purchase » lease purchase (Expand search), declared purchase (Expand search), decrease sucrose (Expand search)
function using » function during (Expand search), reaction using (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 python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
using python » usando python (Expand search), in python (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 purchase programme ) OR ( function using python python programming ))~.