Perhaps you should try some spelling variations:
"pressure research series" » "present research series", "pressure release series", "pressure research services", "pressure research studies", "pressure research summaries"
"resource research theories" » "resources research theories", "resource search theories", "source research theories", "resource research theory", "resource research topics", "resource research three"
"residue research service" » "residues research service", "residual research service", "resident research service", "residue search service", "residue research overview", "residue research section"
"tissue research series" » "issues research series", "disease research series", "tissue research services", "tissue research studies", "tissue research summaries"
"rescue research themes" » "rescue search themes", "issue research themes", "response research themes", "rescue research trends", "rescue research theory"

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 ((("rescue research themes") OR ("resource research theories"))))) OR ("residue research service")).
• Removing quotes may allow a broader search: (((((( tissue research series ) or ( pressure research series ))) or ((( rescue research themes ) or ( resource research theories ))))) or ( residue research service )).
• Adding a wildcard symbol may retrieve word variants: (((((("tissue research series") or ("pressure research series"))) or ((("rescue research themes") or ("resource research theories"))))) or ("residue research service"))*.