Perhaps you should try some spelling variations:
"_ multifactor research : july 2009" » "_ multifactors research : july 2009", "_ multisector research : july 2009", "_ multiactors research : july 2009", "_ multifactor research : july 2008", "_ multifactor research : july 2007", "_ multifactor research : july 2019", "_ multifaceted research : july 2009"
"multi factor research : july 2012" » "multi factors research : july 2012", "multi sector research : july 2012", "multi actors research : july 2012", "multi actor research : july 2012", "multi faceted research : july 2012", "multi factor research : july 2013"

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