Perhaps you should try some spelling variations:
spectral preprocessing » spectral processing (Expand search), textual preprocessing (Expand search)
disease spectral » disease spectrum (Expand search), diverse spectral (Expand search), diseases special (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search)
the decrease » to decrease (Expand search), and decrease (Expand search)
decrease can » decrease in (Expand search), decrease and (Expand search), decrease at (Expand search)
can decrease » can increase (Expand search), and decrease (Expand search), to decrease (Expand search)
decrease of » decrease in (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease of disease spectral preprocessing ) OR ( decrease the decrease can decrease ))~.