Perhaps you should try some spelling variations:
pressure research » present research, pressure release
residue research » residues research, residual research, resident research
rescue research » rescue search, resource research, issue research
research series » research services, research theories, research studies
tissue research » issues 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) OR (pressure research)) series ) OR ( ((tissue research) OR (pressure 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) OR (pressure research)) series ) or ( ((tissue research) OR (pressure research)) studies ))))) or ( residue research series ))".
• Adding a wildcard symbol may retrieve word variants: (((( rescue research series ) or ((( ((tissue research) OR (pressure research)) series ) or ( ((tissue research) OR (pressure research)) studies ))))) or ( residue research series ))*.