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"
"rescue research theories" » "rescue research themes", "rescue research topics", "rescue research three", "rescue search theories", "issue research theories", "response research theories"
"resource research theories" » "resource research themes", "resource research topics", "resource research three", "resources research theories", "source research theories", "resource search theories"
"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 theory" » "rescue search theory", "issue research theory", "response research theory", "rescue research through"

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 theories") OR ("rescue research theory"))) OR ("resource research theories"))))) OR ("residue research service")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"tissue research series\") or (\"pressure research series\"))) or (((((\"rescue research theories\") OR (\"rescue research theory\"))) 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 theories ) OR ( rescue research theory ))) 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 theories") OR ("rescue research theory"))) or ("resource research theories"))))) or ("residue research service"))*.