Perhaps you should try some spelling variations:
accident research » current research, recent research
vaccine research » medicine research
meet accident » depth accident, meet client, post accident
new vaccine » novel vaccine, anti vaccine
july 2009 » july 2008, july 2007, july 2019
july 2012 » 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: (( meet accident research : july 2009 ) OR ( new vaccine research : july 2012 ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( meet accident research : july 2009 ) OR ( new vaccine research : july 2012 ))".
• Adding a wildcard symbol may retrieve word variants: (( meet accident research : july 2009 ) OR ( new vaccine research : july 2012 ))*.