Perhaps you should try some spelling variations:
decrease flying » decrease flooding (Expand search), decrease walking (Expand search), decrease during (Expand search)
decrease rapid » decrease lipid (Expand search), decreased ratio (Expand search), decrease and (Expand search)
rapid decrease » rapidly decrease (Expand search), rapid increase (Expand search), ratio decrease (Expand search)
flying objects » moving objects (Expand search), flying insects (Expand search)
decrease at » decrease akt (Expand search), decrease and (Expand search), decrease in (Expand search)
at decrease » rate decrease (Expand search), that decrease (Expand search), and 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 at decrease ) OR ( decrease rapid decrease flying objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease _ decrease at decrease ) OR ( decrease rapid decrease flying objects ))*.