Perhaps you should try some spelling variations:
"multiple solutions research : july 2006" » "multiple resolution research : july 2006", "multiple situations research : july 2006", "multiple locations research : july 2006", "multiple relations research : july 2006", "multiple pollution research : july 2006", "multiple solutions research : july 2008", "multiple solutions research : july 2007", "multiple solutions research : july 2009"
"multi factor research : july 2011" » "multi factors research : july 2011", "multi sector research : july 2011", "multi actors research : july 2011", "multi actor research : july 2011", "_ multifactor research : july 2011", "multi factor research : july 2013", "multi factor research : july 2012", "multi factor research : july 2015"

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