Perhaps you should try some spelling variations:
"multiple options research : june 2014" » "multiple imputations research : june 2014", "multi option research : june 2014", "multiple operations research : june 2014", "multiple action research : june 2014", "multiple opinion research : june 2014", "multiple options research : june 2013"
"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"

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 ("multiple options research : june 2014"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi factor research : june 2011") OR ("multiple options research : june 2014")).
• Removing quotes may allow a broader search: (( multi factor research : june 2011 ) or ( multiple options research : june 2014 )).
• Adding a wildcard symbol may retrieve word variants: (("multi factor research : june 2011") or ("multiple options research : june 2014"))*.