Perhaps you should try some spelling variations:
depressed surgery » depressed subject (Expand search), directed surgery (Expand search)
during depressed » during depressive (Expand search), during repressive (Expand search), feeling depressed (Expand search)
decrease faster » decrease after (Expand search), decrease further (Expand search), decreased after (Expand search)
faster decrease » rate decrease (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
decrease of » decrease in (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), to 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 faster decrease of decrease ) OR ( decrease during depressed surgery effect ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease faster decrease of decrease ) OR ( decrease during depressed surgery effect ))*.