Perhaps you should try some spelling variations:
"pressure research series" » "present research series", "pressure release series", "pressure research theories", "pressure research studies", "pressure research service"
"residue research services" » "residue research service", "residue search services", "residue search service", "residual research services", "rescue research services", "resident research services"
"residues research services" » "residues research service", "residues search services", "residues search service", "residents research services", "resins research services", "resources research services"
"tissue research series" » "disease research series", "tissue research theories", "tissue research studies", "tissue research service"
"issues research series" » "issues research theories", "issues research studies", "issues research service"

Try widening your search to All Fields.

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: (((((("tissue research series") OR ("pressure research series"))) OR ("issues research series"))) OR ((("residue research services") OR ("residues research services")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"tissue research series\") OR (\"pressure research series\"))) or (\"issues research series\"))) or (((\"residue research services\") or (\"residues research services\"))))".
• Removing quotes may allow a broader search: (((((( tissue research series ) OR ( pressure research series ))) or ( issues research series ))) or ((( residue research services ) or ( residues research services )))).
• Adding a wildcard symbol may retrieve word variants: (((((("tissue research series") OR ("pressure research series"))) or ("issues research series"))) or ((("residue research services") or ("residues research services"))))*.