Perhaps you should try some spelling variations:
"monotypic taxon" » "genotypic taxon", "monotypic talon", "monotypic faxon", "monotypic taxol", "monotypic tfaxon", "monotypic taon", "monotypic taron"
"monotypic saxon" » "genotypic saxon", "monotypic salon", "monotypic saon", "monotypic sexon", "monotypic sanon", "monotypic sfaxon", "monotypic saron"
"monotypic saxo" » "genotypic saxo", "monotypic sao", "monotypic sexo", "monotypic sano"
"monotypic axon" » "genotypic axon", "monotypic faxon", "monotypic aon", "monotypic aron"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"monotypic taxon\") OR (((\"monotypic saxon\") OR (\"monotypic saxo\"))))) OR (\"monotypic axon\"))~".
• Removing quotes may allow a broader search: (((( monotypic taxon ) OR ((( monotypic saxon ) OR ( monotypic saxo ))))) OR ( monotypic axon ))~.
• Adding a wildcard symbol may retrieve word variants: (((("monotypic taxon") OR ((("monotypic saxon") OR ("monotypic saxo"))))) OR ("monotypic axon"))*.