Perhaps you should try some spelling variations:
"multiple options research : june 2014" » "multiple locations research : june 2014", "multiple positions research : june 2014", "multiple solutions research : june 2014", "multiple actions research : june 2014", "multiple optics research : june 2014", "multiple operations research : june 2014", "multiple options research : june 2013"
"multi factor research : june 2008" » "multi factors research : june 2008", "multi sector research : june 2008", "multi actors research : june 2008", "multi actor research : june 2008", "_ multifactor research : june 2008", "multi factor research : june 2007", "multi factor research : june 2013", "multi factor 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 2008") or ("multiple options research : june 2014"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi factor research : june 2008") OR ("multiple options research : june 2014")).
• Removing quotes may allow a broader search: (( multi factor research : june 2008 ) or ( multiple options research : june 2014 )).
• Adding a wildcard symbol may retrieve word variants: (("multi factor research : june 2008") or ("multiple options research : june 2014"))*.