Perhaps you should try some spelling variations:
"multi vaccine research : july 2006" » "multi medicine research : july 2006", "anti vaccine research : july 2006", "multiple vaccines research : july 2006", "multi vaccine research : july 2008", "multi vaccine research : july 2007", "multi vaccine research : july 2009"
"multi action research : july 2006" » "multi national research : july 2006", "multi actor research : july 2006", "multi option research : july 2006", "multi location research : july 2006", "multi action research : july 2008", "multi action research : july 2007", "multi action research : july 2009"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"multi action research : july 2006\") OR (\"multi vaccine research : july 2006\"))~".
• Removing quotes may allow a broader search: (( multi action research : july 2006 ) OR ( multi vaccine research : july 2006 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi action research : july 2006") OR ("multi vaccine research : july 2006"))*.