Perhaps you should try some spelling variations:
"resource research series" » "resources research series", "source research series", "resource search series", "resource research services", "resource research theories", "resource research service"
"residue research series" » "residues research series", "residual research series", "rescue research series", "residue research services", "residue research theories", "residue research service"
"issues research series" » "issues research services", "issues research theories", "issues research service"
"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: (((("resource research series") OR ((("issues research series") OR ((("tissue research studies") OR ("tissue research study"))))))) OR ("residue research series")).
• Removing quotes may allow a broader search: (((( resource research series ) or ((( issues research series ) or ((( tissue research studies ) or ( tissue research study ))))))) or ( residue research series )).
• Adding a wildcard symbol may retrieve word variants: (((("resource research series") or ((("issues research series") or ((("tissue research studies") or ("tissue research study"))))))) or ("residue research series"))*.