Perhaps you should try some spelling variations:
resource research » resources research, resource search, source research
residual research » residues research, resident research, residential research
residue research » residues research, resident research, resins research
rescue research » rescue search, tissue research, issue 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) OR (resource research)) series ) OR ( ((residue research) OR (residual research)) studies )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((rescue research) or (resource research)) series ) or ( ((residue research) OR (residual research)) studies ))".
• Adding a wildcard symbol may retrieve word variants: (( ((rescue research) or (resource research)) series ) or ( ((residue research) OR (residual research)) studies ))*.