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

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: (("multiple options research : july 2009") OR ("multiple action research : july 2012"))~.
• Removing quotes may allow a broader search: (( multiple options research : july 2009 ) or ( multiple action research : july 2012 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multiple options research : july 2009") or ("multiple action research : july 2012"))*.