Perhaps you should try some spelling variations:
"multi factors research : july 2011" » "multi sector research : july 2011", "multi doctoral research : july 2011", "multi crops research : july 2011", "multi factor research : july 2011", "multi actors research : july 2011", "multi actor research : july 2011", "multi factors research : july 2013", "multi factors research : july 2012", "multi factors research : july 2015"
"multiple action research : july 2009" » "multiple options research : july 2009", "multiple actors research : july 2009", "multiple ion research : july 2009", "multiple national research : july 2009", "multiple action research : july 2008", "multiple action research : july 2007", "multiple action 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: (("multiple action research : july 2009") or ("multi factors research : july 2011"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multiple action research : july 2009") OR ("multi factors research : july 2011"))*.
• Removing quotes may allow a broader search: (( multiple action research : july 2009 ) or ( multi factors research : july 2011 ))*.