Perhaps you should try some spelling variations:
"monotypic taxon" » "genotypic taxon", "monotypic talon", "monotypic taxol", "monotypic taon", "monotypic taron", "monotypic texon"
"monotypic faxon" » "genotypic faxon", "monotypic fanon", "monotypic faon", "monotypic faron", "monotypic fexon"
"monotypic saxon" » "genotypic saxon", "monotypic salon", "monotypic saxo", "monotypic saon", "monotypic saron", "monotypic sexon"
"monotypic axon" » "genotypic axon", "monotypic aon", "monotypic aron", "monotypic exon"

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 faxon\") OR (\"monotypic saxon\"))))) OR (\"monotypic axon\"))~".
• Removing quotes may allow a broader search: (((( monotypic taxon ) OR ((( monotypic faxon ) OR ( monotypic saxon ))))) OR ( monotypic axon ))~.
• Adding a wildcard symbol may retrieve word variants: (((("monotypic taxon") OR ((("monotypic faxon") OR ("monotypic saxon"))))) OR ("monotypic axon"))*.