Perhaps you should try some spelling variations:
factor research » sector research, action research, water research
option research » opinion research, action research, operations research
multi factor » multi sector, _ multifactor, multi faceted
multi option » mali options, multiple options
june 2011 » june 2013, june 2014, june 2008
june 2012 » june 2013, june 2014, july 2012

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( multi factor research : june 2011 ) OR ( multi option research : june 2012 ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( multi factor research : june 2011 ) OR ( multi option research : june 2012 ))".
• Adding a wildcard symbol may retrieve word variants: (( multi factor research : june 2011 ) OR ( multi option research : june 2012 ))*.