Perhaps you should try some spelling variations:
"multi factor research : june 2008" » "multi factors research : june 2008", "multi sector research : june 2008", "multi actors research : june 2008", "multi actor research : june 2008", "_ multifactor research : june 2008", "multi factor research : june 2007", "multi factor research : june 2013", "multi factor research : june 2010"
"multi option research : june 2014" » "multi opinion research : june 2014", "multi action research : june 2014", "multi optics research : june 2014", "multi location research : june 2014", "multi population research : june 2014", "multi ratios research : june 2014", "multi option research : june 2013"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("multi factor research : june 2008") or ("multi option research : june 2014"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi factor research : june 2008") OR ("multi option research : june 2014")).
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