Perhaps you should try some spelling variations:
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"multi factors research : july 2013" » "multi sector research : july 2013", "multi doctoral research : july 2013", "multi crops research : july 2013", "multi factor research : july 2013", "multi actors research : july 2013", "multi actor research : july 2013"

You may be able to get more results by adjusting your search query.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("mali options research : july 2012") OR ("multi factors research : july 2013")).
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• Adding a wildcard symbol may retrieve word variants: (("mali options research : july 2012") or ("multi factors research : july 2013"))*.