Perhaps you should try some spelling variations:
"nijhoff book title 2007" » "nijhoff boston title 2007", "nijhoff op title 2007", "nijhoff book titles 2007", "nijhoff book table 2007", "nijhoff work title 2007", "nijhoff book title 2012", "nijhoff book title 27", "nijhoff book title 207", "nijhoff book title 1007", "nijhoff book title 2107"
"nijhoff ebook title 20" » "nijhoff book titles 20", "nijhoff ebook titles 20", "nijhoff ebook table 20", "nijhoff ework title 20", "nijhoff ebook title 2", "nijhoff ebook title 10", "nijhoff ebook title 21"

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 book title 2007") OR ("nijhoff ebook title 20")).
• Removing quotes may allow a broader search: (( nijhoff book title 2007 ) or ( nijhoff ebook title 20 )).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff book title 2007") or ("nijhoff ebook title 20"))*.