Perhaps you should try some spelling variations:
decreased risk » increased risk (Expand search), decreased in (Expand search)
decrease owing » decrease lodging (Expand search), decrease during (Expand search), decrease in (Expand search)
risk decrease » risk decreases (Expand search), risk increase (Expand search), break decrease (Expand search)
owing objects » moving objects (Expand search), using objects (Expand search), flying objects (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)

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

• Removing quotes may allow a broader search: (( decrease _ decreased risk decrease ) OR ( decrease and decrease owing objects ))~.