Perhaps you should try some spelling variations:
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
their decrease » the decrease (Expand search), their disease (Expand search), the decreased (Expand search)
decrease pitch » decrease with (Expand search), decrease its (Expand search), decrease high (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not decrease (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (Expand search)
or decrease » not decrease (Expand search), to decrease (Expand search), _ decrease (Expand search)

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease OR decrease their decrease ) OR ( decrease toc decrease pitch pattern ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease or decrease their decrease ) OR ( decrease toc decrease pitch pattern ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease or decrease their decrease ) OR ( decrease toc decrease pitch pattern ))*.