Perhaps you should try some spelling variations:
decrease housing » decrease during (Expand search), decrease lodging (Expand search), decrease owing (Expand search)
decrease after » increase after (Expand search), disease after (Expand search)
after decrease » faster decrease (Expand search), after deceased (Expand search), litter decrease (Expand search)
housing object » using object (Expand search), housing project (Expand search), moving object (Expand search)
decrease akt » decrease at (Expand search), decrease and (Expand search), decrease with (Expand search)
akt decrease » and decrease (Expand search), not decrease (Expand search), any decrease (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease akt decrease after decrease ) OR ( decrease to decrease housing object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease akt decrease after decrease ) OR ( decrease to decrease housing object ))*.