Perhaps you should try some spelling variations:
"periplus mine workbooks" » "periplus line workbooks", "periplus nine workbooks", "periplus mind workbooks"
"periplus mines workbooks" » "periplus lines workbooks", "periplus nines workbooks", "periplus minds workbooks"
"perils mine cookbooks" » "perils line cookbooks", "perils nine cookbooks", "perils mind cookbooks"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("periplus mine workbooks") OR ("periplus mines workbooks"))) or ("perils mine cookbooks"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("periplus mine workbooks") OR ("periplus mines workbooks"))) OR ("perils mine cookbooks"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"periplus mine workbooks\") OR (\"periplus mines workbooks\"))) or (\"perils mine cookbooks\"))*".
• Removing quotes may allow a broader search: (((( periplus mine workbooks ) OR ( periplus mines workbooks ))) or ( perils mine cookbooks ))*.