Perhaps you should try some spelling variations:
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
their decrease » the decrease (Expand search), their disease (Expand search), the decreased (Expand search)
decreased base » decreased bone (Expand search), decreased brain (Expand search), decreased risk (Expand search)
not decreased » not decrease (Expand search), to decreased (Expand search), not increased (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
base objects » based object (Expand search), use objects (Expand search), page objects (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease their decrease to decrease ) OR ( decrease NOT decreased base objects ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease their decrease to decrease ) OR ( decrease not decreased base objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease their decrease to decrease ) OR ( decrease not decreased base objects ))*.