Talvez deva tentar algumas variações de ortografia:
estimation algorithms » optimization algorithms (Expandir a busca), optimization algorithm (Expandir a busca), approximation algorithms (Expandir a busca)
spectrum estimation » spectrum optimization (Expandir a busca), section estimation (Expandir a busca), spectrum simulation (Expandir a busca)
networks computing » networks computer (Expandir a busca)
elasticity theory » activity theory (Expandir a busca)
theory networks » aleatory networks (Expandir a busca)
algorithms in » algorithms and (Expandir a busca), algorithms _ (Expandir a busca), algorithm _ (Expandir a busca)
in elasticity » and elasticity (Expandir a busca), of elasticity (Expandir a busca), soil elasticity (Expandir a busca)
routines and » routine and (Expandir a busca), routing and (Expandir a busca), routes and (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: routines AND spectrum estimation algorithms in elasticity theory networks computing~.
• Adicionar um caractere curinga pode recuperar variações da palavra buscada: routines and spectrum estimation algorithms in elasticity theory networks computing*.