Perhaps you should try some spelling variations:
faceted research » faceted search, focused research, facetted search
factor research » factors research, sector research, actors research
multi factor » multi actor, multi sector, _ multifactor
july 2006 » july 2008, july 2007, july 2013
july 2009 » july 2008, july 2007, july 2019

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: "(( multi factor research : july 2006 ) OR ( multi faceted research : july 2009 ))~".
• Adding a wildcard symbol may retrieve word variants: (( multi factor research : july 2006 ) OR ( multi faceted research : july 2009 ))*.