Perhaps you should try some spelling variations:
"duplex plainly illustrated" » "duplex explained illustrated", "duplex plainly demonstrated"
"duplex plan illustrated" » "duplex plants illustrated", "duplex land illustrated", "duplex man illustrated", "duplex scan illustrated", "duplex palmar illustrated", "duplex plates illustrated"

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: "((\"duplex plan illustrated\") OR (\"duplex plainly illustrated\"))".
• Removing quotes may allow a broader search: (( duplex plan illustrated ) OR ( duplex plainly illustrated )).
• Adding a wildcard symbol may retrieve word variants: (("duplex plan illustrated") OR ("duplex plainly illustrated"))*.