Perhaps you should try some spelling variations:
"multi crops research : june 2011" » "multi crop research : june 2011", "multi does research : june 2011", "multi copy research : june 2011", "multi actors research : june 2011", "multi campus research : june 2011", "multi crops research : june 2013", "multi crops research : june 2014", "multi crops research : june 2010"
"early climate research : july 2009" » "daily climate research : july 2009", "energy climate research : july 2009", "family climate research : july 2009", "early climate research : july 2008", "early climate research : july 2007", "early climate research : july 2019"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi crops research : june 2011") OR ("early climate research : july 2009"))~.
• Removing quotes may allow a broader search: (( multi crops research : june 2011 ) or ( early climate research : july 2009 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi crops research : june 2011") or ("early climate research : july 2009"))*.