Perhaps you should try some spelling variations:
"multiple options research : july 2012" » "multiple locations research : july 2012", "multiple positions research : july 2012", "multiple solutions research : july 2012", "multiple actions research : july 2012", "multiple optics research : july 2012", "multiple operations research : july 2012", "multiple options research : july 2013"
"multi option research : july 2009" » "multi opinion research : july 2009", "multi action research : july 2009", "multi optics research : july 2009", "multi location research : july 2009", "multi population research : july 2009", "multi ratios research : july 2009", "multi option research : july 2008", "multi option research : july 2007", "multi option research : july 2019"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("multi option research : july 2009") or ("multiple options research : july 2012"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi option research : july 2009") OR ("multiple options research : july 2012"))*.
• Removing quotes may allow a broader search: (( multi option research : july 2009 ) or ( multiple options research : july 2012 ))*.