Talvez deva tentar algumas variações de ortografia:
spectrum approximation » term approximation (Expandir a busca), medium approximation (Expandir a busca)
electrical predictive » eletrica predictive (Expandir a busca), electrical protection (Expandir a busca), electric resistive (Expandir a busca)
methods computation » networks computation (Expandir a busca), network computation (Expandir a busca)
predictive methods » prediction methods (Expandir a busca), inductive methods (Expandir a busca), projective method (Expandir a busca)
algorithms in » algorithms and (Expandir a busca), algorithms _ (Expandir a busca), algorithm _ (Expandir a busca)
in electrical » of electrical (Expandir a busca)
routine and » routines and (Expandir a busca), routing and (Expandir a busca), routine care (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 spectrum approximation algorithms in electrical predictive methods computation~.
• Adicionar um caractere curinga pode recuperar variações da palavra buscada: routine and spectrum approximation algorithms in electrical predictive methods computation*.