Perhaps you should try some spelling variations:
"multiple imputation research : july 2009" » "multiple population research : july 2009", "multiple education research : july 2009", "multiple migration research : july 2009", "multiple imputation research : july 2013", "multiple imputation research : july 2012", "multiple imputation 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("multiple imputation research : july 2009") OR ("multi action research : july 2006"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"multiple imputation research : july 2009\") OR (\"multi action research : july 2006\"))".
• Removing quotes may allow a broader search: (( multiple imputation research : july 2009 ) OR ( multi action research : july 2006 )).
• Adding a wildcard symbol may retrieve word variants: (("multiple imputation research : july 2009") OR ("multi action research : july 2006"))*.