Perhaps you should try some spelling variations:
"residue research studies" » "residues research studies", "residual research studies", "resident research studies", "residue research study"
"rescue research series" » "rescue search series", "resource research series", "tissue research series", "rescue research services", "rescue research theories", "rescue research service"

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 ("residue research studies")).
• Removing quotes may allow a broader search: (( rescue research series ) or ( residue research studies )).
• Adding a wildcard symbol may retrieve word variants: (("rescue research series") or ("residue research studies"))*.