Perhaps you should try some spelling variations:
"residual research studies" » "residues research studies", "residue research studies", "resident research studies"
"residual research study" » "residues research study", "residue research study", "resident research study"
"rescue sr series" » "rescue sar series", "rescue so series", "rescue isk series", "rescue csr series", "rescue spr series", "rescue vr series"

Try widening your search to All Fields.

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