Talvez deva tentar algumas variações de ortografia:
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
rate decrease » rats decreases (Expandir a busca), ratio decrease (Expandir a busca), rate increase (Expandir a busca)
levels using » levels during (Expandir a busca), models using (Expandir a busca), levels among (Expandir a busca)
using python » usando python (Expandir a busca), in python (Expandir a busca)
python rate » python data (Expandir a busca), python based (Expandir a busca), python redes (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( levels using python rate decrease ) OR ( _ python python python programming ))~.