Talvez deva tentar algumas variações de ortografia:
diffraction changes » diffraction enhanced (Expandir a busca), infection changes (Expandir a busca), depuration changes (Expandir a busca)
changes decrease » changes increase (Expandir a busca), change increase (Expandir a busca), recharge decrease (Expandir a busca)
cdc diffraction » ray diffraction (Expandir a busca), and diffraction (Expandir a busca), of diffraction (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
code cdc » code cpc (Expandir a busca), code ctn (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

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