Perhaps you should try some spelling variations:
"resource research theories" » "resources research theories", "resource search theories", "source research theories", "resource research theory", "resource research themes", "resource research topics"
"tissue research studies" » "tissue research study", "issues research studies", "pressure research studies"
"residue research series" » "residues research series", "residual research series", "rescue research series", "residue research services", "residue research service", "residue research summaries"
"tissue research series" » "issues research series", "pressure research series", "tissue research services", "tissue research service", "tissue research summaries"
"disease research series" » "disease research services", "disease research service", "disease research summaries"

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