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

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

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