Perhaps you should try some spelling variations:
diffraction convex » diffraction cone (Expand search), diffraction vortex (Expand search), diffraction on (Expand search)
convex programming » cone programming (Expand search), computer programming (Expand search)
coder diffraction » powder diffraction (Expand search), powder diffractions (Expand search), laser diffraction (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)

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

• Removing quotes may allow a broader search: (( coder coder diffraction convex programming ) OR ( api python python python programming ))~.