Perhaps you should try some spelling variations:
"multi classroom research : july 2011" » "multi class research : july 2011", "quality classroom research : july 2011", "multi classroom research : july 2013", "multi classroom research : july 2015", "multi classroom research : july 2019"
"managing climate research : july 2012" » "changing climate research : july 2012", "warming climate research : july 2012", "managing 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 classroom research : july 2011") OR ("managing climate research : july 2012"))~.
• Removing quotes may allow a broader search: (( multi classroom research : july 2011 ) or ( managing climate research : july 2012 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi classroom research : july 2011") or ("managing climate research : july 2012"))*.