Perhaps you should try some spelling variations:
"multi factor research : july 2009" » "multi factors research : july 2009", "multi sector research : july 2009", "multi actors research : july 2009", "multi actor research : july 2009", "_ multifactor research : july 2009", "multi factor research : july 2008", "multi factor research : july 2007", "multi factor research : july 2019"
"multi action research : july 2009" » "multi national research : july 2009", "multi actor research : july 2009", "multi option research : july 2009", "multi location research : july 2009", "multi action research : july 2008", "multi action research : july 2007", "multi action research : july 2019"

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• Adding a wildcard symbol may retrieve word variants: (("multi factor research : july 2009") OR ("multi action research : july 2009"))*.