Perhaps you should try some spelling variations:
decrease observed » decay observed (Expand search), case observed (Expand search)
decrease lodging » decrease owing (Expand search), decrease during (Expand search), decrease walking (Expand search)
lodging decrease » logging decreases (Expand search), loading decreased (Expand search), taping decrease (Expand search)
observed objects » observed effects (Expand search), submerged objects (Expand search), buried objects (Expand search)
decrease rate » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
rate decrease » rats decreases (Expand search), rate increase (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 rate decrease lodging decrease ) OR ( decrease rate decrease observed objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease rate decrease lodging decrease ) OR ( decrease rate decrease observed objects ))*.