Perhaps you should try some spelling variations:
"duplex explained illustrated" » "duplex explain illustrate", "duplex england illustrated", "duplex ireland illustrated", "builder explained illustrated", "amply explained illustrated", "build explained illustrated"
"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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("duplex plan illustrated") OR ("duplex explained illustrated")).
• Removing quotes may allow a broader search: (( duplex plan illustrated ) or ( duplex explained illustrated )).
• Adding a wildcard symbol may retrieve word variants: (("duplex plan illustrated") or ("duplex explained illustrated"))*.