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 x » diffraction xrd (Expandir a busca), diffraction drx (Expandir a busca), diffraction of (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
x decrease » _ decrease (Expandir a busca), l decrease (Expandir a busca), α decrease (Expandir a busca)
code code » code cdc (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

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