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

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