Talvez deva tentar algumas variações de ortografia:
optimal preprocessing » optical processing (Expandir a busca), spectral preprocessing (Expandir a busca), data preprocessing (Expandir a busca)
decrease optimal » decrease intimate (Expandir a busca), discrete optimal (Expandir a busca), decrease stigma (Expandir a busca)
decrease during » increase during (Expandir a busca), increases during (Expandir a busca), increased during (Expandir a busca)
during decrease » during increased (Expandir a busca), during depressed (Expandir a busca), during disease (Expandir a busca)
decrease can » decrease in (Expandir a busca), decrease and (Expandir a busca), decrease at (Expandir a busca)
can increase » an increase (Expandir a busca), and increase (Expandir a busca), an increased (Expandir a busca)
and decrease » and decreases (Expandir a busca), and decreased (Expandir a busca), and increase (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( decrease during decrease optimal preprocessing ) OR ( decrease can increase and decrease ))~.