Talvez deva tentar algumas variações de ortografia:
code diffraction » powder diffraction (Expandir a busca), wedge diffraction (Expandir a busca), wave diffraction (Expandir a busca)
diffraction des » diffraction drx (Expandir a busca), diffraction models (Expandir a busca), diffraction leed (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
des decrease » does decreased (Expandir a busca), mesh decrease (Expandir a busca), des decrets (Expandir a busca)
code code » code cdc (Expandir a busca)
of python » _ python (Expandir a busca), in python (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( code code diffraction des decrease ) OR ( of python python python programming ))~.