Perhaps you should try some spelling variations:
"_ multinationals research : july 2012" » "_ binational research : july 2012", "_ multinationals report : july 2012", "_ multinationals research : july 2013"
"multi vaccine research : july 2011" » "multi medicine research : july 2011", "anti vaccine research : july 2011", "multiple vaccines research : july 2011", "multi vaccine research : july 2013", "multi vaccine research : july 2015", "multi vaccine research : july 2019"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("_ multinationals research : july 2012") OR ("multi vaccine research : july 2011"))~.
• Removing quotes may allow a broader search: (( _ multinationals research : july 2012 ) or ( multi vaccine research : july 2011 ))~.
• Adding a wildcard symbol may retrieve word variants: (("_ multinationals research : july 2012") or ("multi vaccine research : july 2011"))*.