Perhaps you should try some spelling variations:
during depressed » during depressive (Expand search), during repressive (Expand search), feeling depressed (Expand search)
depressed litter » depressed mother (Expand search), depressed mothers (Expand search), depressed left (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
litter decrease » faster decrease (Expand search), life decrease (Expand search)
decrease on » decrease in (Expand search), decrease or (Expand search), decrease and (Expand search)
on decrease » on decreased (Expand search), of decrease (Expand search), or decrease (Expand search)
decrease of » decrease in (Expand search)
objects » object (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 during depressed litter decrease ) OR ( decrease on decrease of objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease during depressed litter decrease ) OR ( decrease on decrease of objects ))*.