Perhaps you should try some spelling variations:
"new vaccine research : june 2011" » "new medicine research : june 2011", "novel vaccine research : june 2011", "anti vaccine research : june 2011", "new vaccine research : june 2013", "new vaccine research : june 2014", "new vaccine research : june 2010"
"multi client research : july 2011" » "multi accident research : july 2011", "multi climate research : july 2011", "multi current research : july 2011", "multi agent research : july 2011", "multi plant research : july 2011", "multi client research : july 2013", "multi client research : july 2012", "multi client research : july 2015"

Try widening your search to All Fields.

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

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