Perhaps you should try some spelling variations:
"periplus mines workbooks" » "periplus maris workbooks", "periplus lines workbooks", "periplus eines workbooks", "periplus nines workbooks"
"periplus mine workbooks" » "periplus line workbooks", "periplus eine workbooks", "periplus nine workbooks"
"periplus lines workbooks" » "periplus line workbooks"

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: (("periplus mine workbooks") OR ((("periplus mines workbooks") OR ("periplus lines workbooks"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"periplus mine workbooks\") or (((\"periplus mines workbooks\") OR (\"periplus lines workbooks\"))))~".
• Removing quotes may allow a broader search: (( periplus mine workbooks ) or ((( periplus mines workbooks ) OR ( periplus lines workbooks ))))~.
• Adding a wildcard symbol may retrieve word variants: (("periplus mine workbooks") or ((("periplus mines workbooks") OR ("periplus lines workbooks"))))*.