Perhaps you should try some spelling variations:
"multi accident research : june 2012" » "multi current research : june 2012", "multi recent research : june 2012", "multi vaccine research : june 2012", "multi client research : june 2012", "multi accident research : june 2013", "multi accident research : june 2014", "multi accident research : june 2010"
"multi operations research : june 2011" » "mutation operations research : june 2011", "poultry operations research : june 2011", "runtime operations research : june 2011", "multi operations research : june 2013", "multi operations research : june 2014", "multi operations research : june 2010"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("multi accident research : june 2012") or ("multi operations research : june 2011"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi accident research : june 2012") OR ("multi operations research : june 2011")).
• Removing quotes may allow a broader search: (( multi accident research : june 2012 ) or ( multi operations research : june 2011 )).
• Adding a wildcard symbol may retrieve word variants: (("multi accident research : june 2012") or ("multi operations research : june 2011"))*.