Perhaps you should try some spelling variations:
resource research » resources research, source research, resonance research
residue research » residues research, residual research, resident research
research studies » research study
rescue research » rescue search, tissue research, issue research
resource search » resource sears, resource scarce, source search

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