Perhaps you should try some spelling variations:
"tissue research studies" » "tissue research study", "pressure research studies", "disease research studies"
"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"
"issues research series" » "issues research services", "issues research theories", "issues research service"

You may be able to get more results by adjusting your search query.

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