Talvez deva tentar algumas variações de ortografia:
extraction optimization » production optimization (Expandir a busca), selection optimization (Expandir a busca), operational optimization (Expandir a busca)
optimization algorithms » approximation algorithms (Expandir a busca)
and extraction » acid extraction (Expandir a busca), dna extraction (Expandir a busca), data extraction (Expandir a busca)
algorithms in » algorithms and (Expandir a busca), algorithms _ (Expandir a busca), algorithms to (Expandir a busca)
in elasticity » and elasticity (Expandir a busca), of elasticity (Expandir a busca), soil elasticity (Expandir a busca)
routine and » routines and (Expandir a busca), routing and (Expandir a busca), route and (Expandir a busca)
of python » _ python (Expandir a busca), of pathos (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Caso esteja tentando utilizar os operadores booleanos, deve escrevê-los em Letras MAIÚSCULAS: routine AND extraction optimization algorithms in elasticity of python computer~.
• Adicionar um caractere curinga pode recuperar variações da palavra buscada: routine and extraction optimization algorithms in elasticity of python computer*.