Perhaps you should try some spelling variations:
diffusion process » diffusion processes (Expand search)
zone diffusion » drone diffusion (Expand search), ions diffusion (Expand search), ion diffusion (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
coder coder » coder decoder (Expand search), code code (Expand search), decoder codec (Expand search)
coder zone » border zone (Expand search), power zone (Expand search), border zones (Expand search)
in python » _ python (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( coder coder zone diffusion process ) OR ( in python python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( coder coder zone diffusion process ) OR ( in python python python programming ))*.