Perhaps you should try some spelling variations:
multiple options » multiple locations, multiple positions, multiple solutions
options research » actions research, optics research, operations research
ratios research » rating research, relations research, actions research
multi ratios » multi radio, multi rate, multi option
july 2012 » july 2013
july 2007 » july 2008, july 2013, july 2020

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: (( multi ratios research : july 2012 ) OR ( multiple options research : july 2007 ))~.
• Adding a wildcard symbol may retrieve word variants: (( multi ratios research : july 2012 ) or ( multiple options research : july 2007 ))*.