Perhaps you should try some spelling variations:
"multiple imputations research : july 2009" » "multiple imputation research : july 2009", "multiple operations research : july 2009", "multiple population research : july 2009", "multiple institutions research : july 2009", "multiple imputations research : july 2013", "multiple imputations research : july 2012", "multiple imputations research : july 2011"
"multi action research : july 2006" » "multi national research : july 2006", "multi option research : july 2006", "multi factor research : july 2006", "multi action research : july 2013", "multi action research : july 2012", "multi action research : july 2011"

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: (("multiple imputations research : july 2009") OR ("multi action research : july 2006"))~.
• Removing quotes may allow a broader search: (( multiple imputations research : july 2009 ) or ( multi action research : july 2006 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multiple imputations research : july 2009") or ("multi action research : july 2006"))*.