Perhaps you should try some spelling variations:
"anti vaccine research : july 2009" » "anti medicine research : july 2009", "ant vaccine research : july 2009", "active vaccine research : july 2009", "aids vaccine research : july 2009", "anti vaccine research : july 2008", "anti vaccine research : july 2007", "anti vaccine research : july 2019"
"meet action research : july 2006" » "meet national research : july 2006", "meets action research : july 2006", "meet section research : july 2006", "reset action research : july 2006", "meet action research : july 2008", "meet action research : july 2007", "meet action research : july 2013"

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: (("anti vaccine research : july 2009") or ("meet action research : july 2006"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("anti vaccine research : july 2009") OR ("meet action research : july 2006")).
• Removing quotes may allow a broader search: (( anti vaccine research : july 2009 ) or ( meet action research : july 2006 )).
• Adding a wildcard symbol may retrieve word variants: (("anti vaccine research : july 2009") or ("meet action research : july 2006"))*.