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To see all available qualifiers, see our documentation.
See https://guangchuangyu.github.io/ggtree/faq/#could-not-find-function.
No term enriched is a valid result. That means no term pass the user setting, e.g. minGSSize, maxGSSize, pvalueCutoff and qvalueCutoff.
minGSSize
maxGSSize
pvalueCutoff
qvalueCutoff
See also my answer in Bioconductor support site 1 and 2.