Perhaps you should try some spelling variations:
decreased metal » decreased mental (Expand search), decreased total (Expand search), decreased mean (Expand search)
decrease risk » decreased risk (Expand search), increase risk (Expand search), decrease in (Expand search)
risk decrease » risk decreases (Expand search), risk increase (Expand search), break decrease (Expand search)
metal objects » real objects (Expand search), metallic objects (Expand search), data objects (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 (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 the decrease risk decrease ) OR ( decrease _ decreased metal objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease the decrease risk decrease ) OR ( decrease _ decreased metal objects ))*.