Perhaps you should try some spelling variations:
"multi educational research : july 2006" » "maxi educational research : july 2006", "multi generational research : july 2006", "multi national research : july 2006", "multi educational research : july 2008", "multi educational research : july 2007", "multi educational research : july 2013"
"multi labor research : july 2009" » "multi water research : july 2009", "multi prior research : july 2009", "multi layer research : july 2009", "multi label research : july 2009", "multi factor research : july 2009", "multi labor research : july 2008", "multi labor research : july 2007", "multi labor research : july 2019"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"multi labor research : july 2009\") OR (\"multi educational research : july 2006\"))~".
• Removing quotes may allow a broader search: (( multi labor research : july 2009 ) OR ( multi educational research : july 2006 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi labor research : july 2009") OR ("multi educational research : july 2006"))*.