Perhaps you should try some spelling variations:
their programming » their reprogramming (Expand search), theory programming (Expand search), the programming (Expand search)
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
python engine » piston engine (Expand search)
engine python » online python (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
decrease of » decrease in (Expand search)
of decrease » not decrease (Expand search), to decrease (Expand search), of decree (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 their programming ) OR ( python engine python python programming ))~.