Talvez deva tentar algumas variações de ortografia:
in preprocessing » in reprocessing (Expandir a busca), and preprocessing (Expandir a busca), via preprocessing (Expandir a busca)
decrease ratio » decreased ratio (Expandir a busca), decrease at (Expandir a busca), decreased rate (Expandir a busca)
ratio decrease » rate decrease (Expandir a busca), brazil decrease (Expandir a busca), to decrease (Expandir a busca)
decrease the » decreases the (Expandir a busca)
the decrease » to decrease (Expandir a busca), and decrease (Expandir a busca)
of decrease » or decrease (Expandir a busca), not decrease (Expandir a busca), to decrease (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( decrease of decrease in preprocessing ) OR ( decrease ratio decrease the decrease ))~.