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 hole » diffraction cone (Expandir a busca), diffraction phase (Expandir a busca), diffraction of (Expandir a busca)
hole decrease » help decrease (Expandir a busca), volume decrease (Expandir a busca), while decreases (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (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 hole decrease ) OR ( _ python python python programming ))~.