Perhaps you should try some spelling variations:
"pressure research series" » "pressure release series", "pressure research services", "pressure research theories", "pressure research studies"
"present research series" » "recent research series", "prevention research series", "treatment research series", "present research services", "present research theories", "present research studies"
"residue research series" » "residues research series", "residual research series", "resident research series", "residue research services", "residue research theories", "residue research studies"
"rescue research series" » "rescue search series", "resource research series", "issue research series", "rescue research services", "rescue research theories", "rescue research studies"
"tissue research series" » "tissue research services", "tissue research theories", "tissue research studies", "issues research series", "disease research series"

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