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 saxo", "monotypic sfaxon", "monotypic saon", "monotypic saron"
"monotypic saron" » "genotypic saron"
"monotypic axon" » "genotypic axon", "monotypic faxon", "monotypic aon", "monotypic aron"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("monotypic taxon") OR ((("monotypic saxon") OR ("monotypic saron"))))) OR ("monotypic axon"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"monotypic taxon\") OR (((\"monotypic saxon\") OR (\"monotypic saron\"))))) OR (\"monotypic axon\"))*".
• Removing quotes may allow a broader search: (((( monotypic taxon ) OR ((( monotypic saxon ) OR ( monotypic saron ))))) OR ( monotypic axon ))*.