Perhaps you should try some spelling variations:
"anti vaccine research : july 2019" » "anti medicine research : july 2019", "ant vaccine research : july 2019", "active vaccine research : july 2019", "aids vaccine research : july 2019", "anti vaccine research : july 2013", "anti vaccine research : july 2012", "anti vaccine research : july 2015"
"multinationals _ research : july 2009" » "multinationals _ research : july 2008", "multinationals _ research : july 2007", "multinationals _ research : july 2006"

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: "((\"multinationals _ research : july 2009\") OR (\"anti vaccine research : july 2019\"))~".
• Removing quotes may allow a broader search: (( multinationals _ research : july 2009 ) OR ( anti vaccine research : july 2019 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multinationals _ research : july 2009") OR ("anti vaccine research : july 2019"))*.