Perhaps you should try some spelling variations:
decrease quality » increase quality (Expand search), disease quality (Expand search)
python teaching » action teaching (Expand search), fashion teaching (Expand search), opinion teaching (Expand search)
teaching python » learning python (Expand search), teaching path (Expand search), teaching paths (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decrease on (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not decrease (Expand search)

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

• Removing quotes may allow a broader search: (( decrease toc decrease quality program ) OR ( python teaching python python programming ))~.