Perhaps you should try some spelling variations:
"plant gene research." » "plant gender research.", "plant genome research.", "plant zone research.", "plant genetic research.", "plant genomes research."
"Plant case research." » "Plant use research.", "Plant change research.", "Plant disease research."
plant case » plants case, plans case, plan case
"plant care research." » "plant cape research.", "plant cures research.", "plant code research."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("plant gene research.") or ((("Plant case research.") or ("plant care research."))))~.
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• Adding a wildcard symbol may retrieve word variants: (("plant gene research.") or ((("Plant case research.") or ("plant care research."))))*.