Perhaps you should try some spelling variations:
"wealth educational research : july 2011" » "wealth education research : july 2011", "health education research : july 2011", "meals educational research : july 2011", "wealth educational research : july 2013", "wealth educational research : july 2012", "wealth educational research : july 2015"
"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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi labor research : july 2009") OR ("wealth educational research : july 2011"))~.
• Removing quotes may allow a broader search: (( multi labor research : july 2009 ) or ( wealth educational research : july 2011 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi labor research : july 2009") or ("wealth educational research : july 2011"))*.