Perhaps you should try some spelling variations:
"resource research series" » "resources research series", "resource search series", "source research series", "resource research services", "resource research theories", "resource research studies"
"rescue search theory" » "rescue sar theory", "rescue research 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: (("resource research series") OR ("rescue search theory")).
• Removing quotes may allow a broader search: (( resource research series ) or ( rescue search theory )).
• Adding a wildcard symbol may retrieve word variants: (("resource research series") or ("rescue search theory"))*.