Perhaps you should try some spelling variations:
risk decreased » risk decreases (Expand search), is decreased (Expand search), cross decreased (Expand search)
decrease costs » decreasing costs (Expand search), decreases post (Expand search), disease costs (Expand search)
costs decrease » loss decrease (Expand search), not decrease (Expand search), cells decrease (Expand search)
decrease metal » decreased metal (Expand search), decrease fetal (Expand search), decreased mental (Expand search)
decrease risk » decreased risk (Expand search), increase risk (Expand search), decrease in (Expand search)
metal objects » real objects (Expand search), metallic objects (Expand search), data objects (Expand search)
decreased to » decreased the (Expand search), decreased tgf (Expand search), decreased in (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 risk decreased to decrease ) OR ( decrease costs decrease metal objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease risk decreased to decrease ) OR ( decrease costs decrease metal objects ))*.