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

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 ( tissue research studies ))))) OR ( residual research series )).
• Adding a wildcard symbol may retrieve word variants: (((( rescue research series ) or ((( tissue research series ) or ( tissue research studies ))))) or ( residual research series ))*.