Perhaps you should try some spelling variations:
during depressed » during depressive (Expand search), during repressive (Expand search), feeling depressed (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (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)
depressed the » depresses the (Expand search), depress the (Expand search), depressao the (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (Expand search)
or decrease » of decrease (Expand search), not decrease (Expand search), to decrease (Expand search)
the basal » the nasal (Expand search), the basic (Expand search), the basis (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 risk decrease OR decrease ) OR ( decrease during depressed the basal ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease risk decrease or decrease ) OR ( decrease during depressed the basal ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease risk decrease or decrease ) OR ( decrease during depressed the basal ))*.