Perhaps you should try some spelling variations:
"rescue research theories" » "rescue research themes", "rescue research topics", "rescue research three", "residue research theories", "resource research theories", "tissue research theories"
"rescue research series" » "residue research series", "resource research series", "tissue research series", "rescue research services", "rescue research studies", "rescue research service"
"rescue research theory" » "residue research theory", "resource research theory", "tissue research theory", "rescue research through"
"rescue search theory" » "rescue sar theory"

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: (("rescue research series") OR ((("rescue research theories") OR ((("rescue research theory") OR ("rescue search theory")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"rescue research series\") or (((\"rescue research theories\") or (((\"rescue research theory\") OR (\"rescue search theory\"))))))".
• Removing quotes may allow a broader search: (( rescue research series ) or ((( rescue research theories ) or ((( rescue research theory ) OR ( rescue search theory )))))).
• Adding a wildcard symbol may retrieve word variants: (("rescue research series") or ((("rescue research theories") or ((("rescue research theory") OR ("rescue search theory"))))))*.