Perhaps you should try some spelling variations:
medicine research » medical research, media research, vaccine research
factor research » factors research, sector research, actors research
multi factor » multi actor, multi sector, _ multifactor
july 2007 » july 2013, july 2012, july 2020
july 2008 » july 2013, july 2012, july 2020

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( multi medicine research : july 2007 ) OR ( multi factor research : july 2008 ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( multi medicine research : july 2007 ) OR ( multi factor research : july 2008 ))".
• Adding a wildcard symbol may retrieve word variants: (( multi medicine research : july 2007 ) OR ( multi factor research : july 2008 ))*.