Perhaps you should try some spelling variations:
"issues research studies" » "issues research study"
"residue research series" » "residues research series", "residual research series", "resident research series", "residue research services", "residue research theories", "residue research service"
"rescue research series" » "rescue search series", "resource research series", "issue research series", "rescue research services", "rescue research theories", "rescue research service"
"tissue research series" » "tissue research services", "tissue research theories", "tissue research service", "pressure research series", "disease research series"
"issues research series" » "issues research services", "issues research theories", "issues 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 series") OR ((("tissue research series") OR ((("issues research series") OR ("issues research studies"))))))) OR ("residue research series")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"rescue research series\") or (((\"tissue research series\") or (((\"issues research series\") OR (\"issues research studies\"))))))) or (\"residue research series\"))".
• Removing quotes may allow a broader search: (((( rescue research series ) or ((( tissue research series ) or ((( issues research series ) OR ( issues research studies ))))))) or ( residue research series )).
• Adding a wildcard symbol may retrieve word variants: (((("rescue research series") or ((("tissue research series") or ((("issues research series") OR ("issues research studies"))))))) or ("residue research series"))*.