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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("multi national research : july 2009") OR ("anti vaccine research : july 2006"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"multi national research : july 2009\") OR (\"anti vaccine research : july 2006\"))".
• Removing quotes may allow a broader search: (( multi national research : july 2009 ) OR ( anti vaccine research : july 2006 )).
• Adding a wildcard symbol may retrieve word variants: (("multi national research : july 2009") OR ("anti vaccine research : july 2006"))*.