Perhaps you should try some spelling variations:
multiple options » multiple locations, multiple positions, multiple solutions
options research » actions research, optics research, operations research
multiple opinion » multiple positions, multiple decision, multiple ion
opinion research » action research
july 2009 » july 2008, july 2007, july 2019
july 2012 » july 2013

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 2009 ) OR ( multiple opinion research : july 2012 ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( multiple options research : july 2009 ) OR ( multiple opinion research : july 2012 ))".
• Adding a wildcard symbol may retrieve word variants: (( multiple options research : july 2009 ) OR ( multiple opinion research : july 2012 ))*.