Perhaps you should try some spelling variations:
"research state papers" » "research status papers", "research strategy papers", "research station papers", "research staff papers"
"research later papers" » "research water papers", "research laser papers", "research lter papers", "research kater papers", "research larger papers", "research laserr papers", "research late papers", "research latin papers"
"research gate papers" » "research gated papers", "research game papers", "research kate papers", "research late papers", "research waste papers", "research care papers"
"research late paper" » "research kate paper", "research large paper", "research laser paper", "research waste paper"

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: (("research state papers") OR ((("research gate papers") OR ((("research later papers") OR ("research late paper")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"research state papers\") or (((\"research gate papers\") or (((\"research later papers\") OR (\"research late paper\"))))))".
• Removing quotes may allow a broader search: (( research state papers ) or ((( research gate papers ) or ((( research later papers ) OR ( research late paper )))))).
• Adding a wildcard symbol may retrieve word variants: (("research state papers") or ((("research gate papers") or ((("research later papers") OR ("research late paper"))))))*.