Perhaps you should try some spelling variations:
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
during decrease » during increased (Expand search), during depressed (Expand search), during disease (Expand search)
decrease flying » decrease flooding (Expand search), decrease walking (Expand search), decrease owing (Expand search)
flying objects » moving objects (Expand search), flying insects (Expand search)
decrease life » decrease liver (Expand search), increase life (Expand search), decreases liver (Expand search)
life decrease » life decreases (Expand search), life decreased (Expand search), life increase (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 life decrease during decrease ) OR ( decrease NOT decrease flying objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease life decrease during decrease ) OR ( decrease NOT decrease flying objects ))*.