Perhaps you should try some spelling variations:
during depressed » during depressive (Expand search), during repressive (Expand search), feeling depressed (Expand search)
decrease litter » increased litter (Expand search), decrease after (Expand search), decreases liver (Expand search)
litter decrease » faster decrease (Expand search), life decrease (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
decrease grain » decreased brain (Expand search), decreases brain (Expand search), increase grain (Expand search)
depressed on » depressed and (Expand search), expressed on (Expand search), depressed nk (Expand search)
on decrease » on decreased (Expand search), of decrease (Expand search), or 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 litter decrease grain processing ) OR ( decrease during depressed on decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease litter decrease grain processing ) OR ( decrease during depressed on decrease ))*.