Perhaps you should try some spelling variations:
multiple vaccines » multiple access, multiple crises, multiple faces
vaccines research » vaccine research, practices research, accidents research
client research » accident research, climate research, current research
multi client » multi agent, multi plant
july 2007 » july 2008, 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 client research : july 2013 ) or ( multiple vaccines research : july 2007 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( multi client research : july 2013 ) OR ( multiple vaccines research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (( multi client research : july 2013 ) or ( multiple vaccines research : july 2007 ))*.