Perhaps you should try some spelling variations:
"using national research : july 2009" » "using educational research : july 2009", "using natural research : july 2009", "using national research : july 2006", "using national research : july 2013", "using national research : july 2012"
"mali options research : july 2011" » "mali operations research : july 2011", "mali action research : july 2011", "mali opinion research : july 2011", "call options research : july 2011", "making options research : july 2011", "scale options research : july 2011", "mali options research : july 2013", "mali options research : july 2012", "mali options research : june 2011"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("using national research : july 2009") or ("mali options research : july 2011"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("using national research : july 2009") OR ("mali options research : july 2011")).
• Removing quotes may allow a broader search: (( using national research : july 2009 ) or ( mali options research : july 2011 )).
• Adding a wildcard symbol may retrieve word variants: (("using national research : july 2009") or ("mali options research : july 2011"))*.