Perhaps you should try some spelling variations:
"models extending research : july 2009" » "models extended research : july 2009", "models embedding research : july 2009", "models extending reach : july 2009", "models extensions research : july 2009", "models depending research : july 2009", "moreira extending research : july 2009", "models extending research : july 2008", "models extending research : july 2007", "models extending research : july 2019"
"multi recent research : july 2012" » "multi current research : july 2012", "mali recent research : july 2012", "multi agent research : july 2012", "multi client research : july 2012", "multi recent research : july 2013"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("models extending research : july 2009") or ("multi recent research : july 2012"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("models extending research : july 2009") OR ("multi recent research : july 2012")).
• Removing quotes may allow a broader search: (( models extending research : july 2009 ) or ( multi recent research : july 2012 )).
• Adding a wildcard symbol may retrieve word variants: (("models extending research : july 2009") or ("multi recent research : july 2012"))*.