Perhaps you should try some spelling variations:
"residue research theories" » "residue research theory", "residue research themes", "residue research topics", "residues research theories", "residual research theories", "rescue research theories"
"disease research studies" » "disease research study"
"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"

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