Perhaps you should try some spelling variations:
decrease learning » increases learning (Expand search), decreases weaning (Expand search), defense learning (Expand search)
learning object » learning objects (Expand search)
costs decrease » loss decrease (Expand search), not decrease (Expand search), cells decrease (Expand search)
disease costs » disease cost (Expand search), disease cross (Expand search), disease cases (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
not disease » knot disease (Expand search), rot disease (Expand search), host disease (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (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 NOT disease costs decrease ) OR ( decrease in decrease learning object ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease not disease costs decrease ) OR ( decrease in decrease learning object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease not disease costs decrease ) OR ( decrease in decrease learning object ))*.