Perhaps you should try some spelling variations:
"nijhoff ebook title 20" » "nijhoff book title 20", "nijhoff book titles 20", "nijhoff ebook title 10", "nijhoff ebook title 21", "nijhoff ebook title 26", "nijhoff ebook title _0", "nijhoff ebook title a0"
"nijhoff ebook title 25" » "nijhoff book title 25", "nijhoff book titles 25", "nijhoff ebook title 21", "nijhoff ebook title 5", "nijhoff ebook title 26", "nijhoff ebook title _5", "nijhoff ebook title a5", "nijhoff ebook title 15"
"nijhoff ebook title 2" » "nijhoff book title 2", "nijhoff book titles 2", "nijhoff ebook title _", "nijhoff ebook title a", "nijhoff ebook title 1"

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: (("nijhoff ebook title 20") OR ((("nijhoff ebook title 25") OR ("nijhoff ebook title 2"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nijhoff ebook title 20\") or (((\"nijhoff ebook title 25\") OR (\"nijhoff ebook title 2\"))))*".
• Removing quotes may allow a broader search: (( nijhoff ebook title 20 ) or ((( nijhoff ebook title 25 ) OR ( nijhoff ebook title 2 ))))*.