Perhaps you should try some spelling variations:
factor research » factors research, sector research, actors research
multi factor » multi actor, multi sector, _ multifactor
rl actions » re actions, 3 actions, en actions
2 actions » 2 action, 3.2 actions, 2 actors
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: (( ((rl actions) OR (2 actions)) research : july 2006 ) OR ( multi factor research : july 2011 ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((rl actions) OR (2 actions)) research : july 2006 ) or ( multi factor research : july 2011 ))~".
• Adding a wildcard symbol may retrieve word variants: (( ((rl actions) OR (2 actions)) research : july 2006 ) or ( multi factor research : july 2011 ))*.