Perhaps you should try some spelling variations:
housing research » doing research, existing research
actors research » factors research, actions research, author's research
making housing » making using, leaving housing, meshing housing
call actors » all actors, local actors, chain actors
july 2011 » july 2013, july 2012, july 2015
july 2006 » july 2008, july 2007, july 2009

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: (( making housing research : july 2011 ) OR ( call actors research : july 2006 ))~.
• Adding a wildcard symbol may retrieve word variants: (( making housing research : july 2011 ) or ( call actors research : july 2006 ))*.