Perhaps you should try some spelling variations:
multiple options » multiple locations, multiple positions, multiple solutions
options research » actions research, optics research, operations research
change research » science research
multi change » multi channel, multi angle, multi image
july 2007 » july 2008, july 2012, july 2020

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( multi change research : july 2013 ) or ( multiple options research : july 2007 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( multi change research : july 2013 ) OR ( multiple options research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (( multi change research : july 2013 ) or ( multiple options research : july 2007 ))*.