Perhaps you should try some spelling variations:
actions research » action research, actional research, actors research
factor research » factors research, sector research, actors research
multi factor » multi actor, multi sector, _ multifactor
re actions » rl actions, more actions, des actions
july 2006 » july 2008, july 2007, july 2009
july 2011 » july 2013, july 2012, july 2015

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: (( re actions research : july 2006 ) OR ( multi factor research : july 2011 ))~.
• Adding a wildcard symbol may retrieve word variants: (( re actions research : july 2006 ) or ( multi factor research : july 2011 ))*.