Perhaps you should try some spelling variations:
"tissue research summaries" » "tissue research summary", "tissue research libraries", "issues research summaries", "pressure research summaries", "disease research summaries"
"rescue research theories" » "rescue research theory", "rescue research themes", "rescue research topics", "rescue search theories", "resource research theories", "issue research 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", "pressure research series", "disease research series", "tissue research services", "tissue research studies", "tissue research seminars"

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