Perhaps you should try some spelling variations:
pain decreases » pain decrease (Expand search), brain decreases (Expand search), pten decreases (Expand search)
decreases rate » decreased rate (Expand search), decreases water (Expand search), decreases brain (Expand search)
decrease pain » decreases pain (Expand search), decrease in (Expand search), decreased brain (Expand search)
rate decrease » rats decreases (Expand search), rate increase (Expand search), to decrease (Expand search)
decrease mass » decreased base (Expand search), decrease costs (Expand search), decrease men's (Expand search)
mass objects » image objects (Expand search), press objects (Expand search), and objects (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 pain decreases rate decrease ) OR ( decrease AND decrease mass objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease pain decreases rate decrease ) OR ( decrease AND decrease mass objects ))*.