Perhaps you should try some spelling variations:
"rescue research studies" » "rescue research study", "residue research studies", "rescue search studies", "resource research studies"
"issues research series" » "issues research services", "issues research theories", "issues research service"
"residue search services" » "residue search service", "residue research service", "residue health services", "residue research services", "rescue search services", "residues research services"

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 studies\") OR (\"issues research series\"))) OR (\"residue search services\"))".
• Removing quotes may allow a broader search: (((( rescue research studies ) OR ( issues research series ))) OR ( residue search services )).
• Adding a wildcard symbol may retrieve word variants: (((("rescue research studies") OR ("issues research series"))) OR ("residue search services"))*.