Perhaps you should try some spelling variations:
"multi factor research : june 2011" » "multi sector research : june 2011", "multi action research : june 2011", "multi water research : june 2011", "_ multifactor research : june 2011", "multi faceted research : june 2011", "multi factor research : june 2013", "multi factor research : june 2012", "multi factor research : june 2008"
"multi option research : june 2014" » "multi opinion research : june 2014", "multi action research : june 2014", "multi operations research : june 2014", "mali options research : june 2014", "multiple options research : june 2014", "multi option research : june 2013"

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 2014"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"multi factor research : june 2011\") OR (\"multi option research : june 2014\"))".
• Removing quotes may allow a broader search: (( multi factor research : june 2011 ) OR ( multi option research : june 2014 )).
• Adding a wildcard symbol may retrieve word variants: (("multi factor research : june 2011") OR ("multi option research : june 2014"))*.