Perhaps you should try some spelling variations:
"issues research theories" » "issues research theory", "issues research themes", "issues research topics"
"residue research series" » "residues research series", "residual research series", "resident research series", "residue research services", "residue research service", "residue research summaries"
"rescue research series" » "rescue search series", "resource research series", "issue research series", "rescue research services", "rescue research service", "rescue research summaries"
"issues research series" » "issues research services", "issues research service", "issues research summaries"
"tissue research studies" » "pressure research studies", "disease research studies"
"tissue research study" » "pressure research study", "disease research study"

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