Talvez deva tentar algumas variações de ortografia:
extraction method » extraction methods (Expandir a busca)
power functions » power function (Expandir a busca), motor functions (Expandir a busca), taper functions (Expandir a busca)
pre extraction » ore extraction (Expandir a busca), press extraction (Expandir a busca), tree extraction (Expandir a busca)
functions pre » functions are (Expandir a busca), function pre (Expandir a busca), functional pre (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
using codigo » using indigo (Expandir a busca), using coding (Expandir a busca), using codium (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( power functions pre extraction method ) OR ( using codigo python python programming ))~.