Perhaps you should try some spelling variations:
action research » national research
water research » water resource, further research
multi action » multi actor, multi option, multi location
multi water » multi rater, multi layer, multi rate
july 2006 » july 2008, july 2007, july 2009
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: (( multi action research : july 2006 ) or ( multi water research : july 2012 ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( multi action research : july 2006 ) OR ( multi water research : july 2012 )).
• Adding a wildcard symbol may retrieve word variants: (( multi action research : july 2006 ) or ( multi water research : july 2012 ))*.