Talvez deva tentar algumas variações de ortografia:
diffraction prevent » fraction prevent (Expandir a busca), diffraction experiment (Expandir a busca), diffraction rietveld (Expandir a busca)
code diffraction » powder diffraction (Expandir a busca), wedge diffraction (Expandir a busca), wave diffraction (Expandir a busca)
prevent decrease » prevents increase (Expandir a busca), prevents increased (Expandir a busca), elements decrease (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 prevent decrease ) OR ( _ python python python programming ))~.