Perhaps you should try some spelling variations:
"plants disease research." » "plants diseases research.", "plant disease research.", "plant diseases research."
"plant genome research." » "plant genomic research.", "plant genomics research.", "plant gender research."
"plant gene research." » "plant gender research.", "plant zone research.", "plant genetic research.", "plant genomes research."
"plant some research." » "plant care research.", "plant case research.", "plane some research.", "plant soma research.", "plant soil research."
"plants use research." » "plants care research.", "plants used research.", "plant use research.", "plants useful research."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("plant gene research.") or ((("plant genome research.") OR ("plant some research."))))) or ((("plants disease research.") or ("plants use research."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("plant gene research.") OR ((("plant genome research.") OR ("plant some research."))))) OR ((("plants disease research.") OR ("plants use research.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"plant gene research.\") or (((\"plant genome research.\") OR (\"plant some research.\"))))) or (((\"plants disease research.\") or (\"plants use research.\"))))".
• Removing quotes may allow a broader search: (((( plant gene research. ) or ((( plant genome research. ) OR ( plant some research. ))))) or ((( plants disease research. ) or ( plants use research. )))).
• Adding a wildcard symbol may retrieve word variants: (((("plant gene research.") or ((("plant genome research.") OR ("plant some research."))))) or ((("plants disease research.") or ("plants use research."))))*.