Perhaps you should try some spelling variations:
"multi cleaner research : july 2007" » "multi cancer research : july 2007", "multi later research : july 2007", "multi theater research : july 2007", "multi layer research : july 2007", "multi cleaner research : july 2008", "multi cleaner research : july 2012", "multi cleaner research : july 2020"
"managing climate research : july 2013" » "changing climate research : july 2013", "warming climate research : july 2013"

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 cleaner research : july 2007") OR ("managing climate research : july 2013"))~.
• Removing quotes may allow a broader search: (( multi cleaner research : july 2007 ) or ( managing climate research : july 2013 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi cleaner research : july 2007") or ("managing climate research : july 2013"))*.