Perhaps you should try some spelling variations:
decrease comprehension » disease comprehension (Expand search), discourse comprehension (Expand search), sentence comprehension (Expand search)
comprehension process » comprehension test (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the decrease » to decrease (Expand search), and decrease (Expand search)
decrease toc » decrease of (Expand search), decreased to (Expand search), decrease on (Expand search)
toc decrease » to decrease (Expand search), not decrease (Expand search), of decrease (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease AND decrease the decrease ) OR ( decrease toc decrease comprehension process ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease AND decrease the decrease ) OR ( decrease toc decrease comprehension process ))*.