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 i » diffraction in (Expandir a busca), diffraction i1 (Expandir a busca), diffraction x (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
i decrease » _ decrease (Expandir a busca), l decrease (Expandir a busca), α decrease (Expandir a busca)
code code » code cdc (Expandir a busca)
in python » _ 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 i decrease ) OR ( in python python python programming ))~.