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)
decrease costs » decreasing costs (Expand search), decreases post (Expand search), disease costs (Expand search)
decreased that » decreased the (Expand search), decreased total (Expand search), decreased heart (Expand search)
costs decrease » loss decrease (Expand search), not decrease (Expand search), cells decrease (Expand search)
that decrease » that increase (Expand search), that increases (Expand search), not decrease (Expand search)
on decreased » in decreased (Expand search), of decreased (Expand search), on deceased (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (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 on decreased that decrease ) OR ( decrease costs decrease learning object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease on decreased that decrease ) OR ( decrease costs decrease learning object ))*.