Perhaps you should try some spelling variations:
multiple options » multiple locations, multiple positions, multiple solutions
options research » actions research, optics research, operations research
action research » national research
multi action » multi actor, multi option, multi location
july 2006 » july 2008, july 2009, july 2013
july 2007 » july 2008, july 2013, 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: (( multiple options research : july 2006 ) or ( multi action research : july 2007 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( multiple options research : july 2006 ) OR ( multi action research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (( multiple options research : july 2006 ) or ( multi action research : july 2007 ))*.