Perhaps you should try some spelling variations:
"making national research : july 2012" » "making educational research : july 2012", "making vocational research : july 2012", "managing national research : july 2012", "using national research : july 2012", "making national research : july 2013"
"mali operations research : june 2011" » "taxi operations research : june 2011", "bank operations research : june 2011", "day operations research : june 2011", "mali operations research : june 2013", "mali operations research : june 2014", "mali operations research : june 2012"

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: (("making national research : july 2012") OR ("mali operations research : june 2011"))~.
• Removing quotes may allow a broader search: (( making national research : july 2012 ) or ( mali operations research : june 2011 ))~.
• Adding a wildcard symbol may retrieve word variants: (("making national research : july 2012") or ("mali operations research : june 2011"))*.