Perhaps you should try some spelling variations:
"multi factor research : june 2011" » "multi factors research : june 2011", "multi sector research : june 2011", "multi actors research : june 2011", "multi actor research : june 2011", "_ multifactor research : june 2011", "multi factor research : june 2013", "multi factor research : june 2014", "multi factor research : june 2010"
"multi option research : june 2011" » "multi opinion research : june 2011", "multi action research : june 2011", "multi optics research : june 2011", "multi location research : june 2011", "multi population research : june 2011", "multi ratios research : june 2011", "multi option research : june 2013", "multi option research : june 2014", "multi option research : june 2010"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("multi factor research : june 2011") or ("multi option research : june 2011"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi factor research : june 2011") OR ("multi option research : june 2011"))*.
• Removing quotes may allow a broader search: (( multi factor research : june 2011 ) or ( multi option research : june 2011 ))*.