Perhaps you should try some spelling variations:
"multiple imputations research : july 2009" » "multiple imputation research : july 2009", "multiple implications research : july 2009", "multiple mutation research : july 2009", "multiple reputation research : july 2009", "multiple imputations research : july 2008", "multiple imputations research : july 2007", "multiple imputations research : july 2019"
"mali options research : july 2009" » "mali actions research : july 2009", "mali optics research : july 2009", "mali operations research : july 2009", "scale options research : july 2009", "i options research : july 2009", "iii options research : july 2009", "mali options research : july 2008", "mali options research : july 2007", "mali options research : july 2019"

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