Perhaps you should try some spelling variations:
multiple options » multiple locations, multiple positions, multiple solutions
options research » actions research, optics research, operations research
cancer research » water research, gender research, consumer research
multi cancer » multiple cancer, multi channel, multi cleaner
july 2007 » july 2008, july 2013, july 2012

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( multi cancer research : july 2007 ) or ( multiple options research : july 2007 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( multi cancer research : july 2007 ) OR ( multiple options research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (( multi cancer research : july 2007 ) or ( multiple options research : july 2007 ))*.