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), disease during (Expand search)
oil processing » gel processing (Expand search), signal processing (Expand search), visual processing (Expand search)
depressed oil » pressed oil (Expand search), depressed i (Expand search), depressed mood (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)
on decrease » on decreased (Expand search), or decrease (Expand search), of 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 _ decrease on decrease ) OR ( decrease during depressed oil processing ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease _ decrease on decrease ) OR ( decrease during depressed oil processing ))*.