Perhaps you should try some spelling variations:
"nijhoff book title 26" » "nijhoff boston title 26", "nijhoff op title 26", "nijhoff book titles 26", "nijhoff book table 26", "nijhoff work title 26", "nijhoff book title 21", "nijhoff book title 25", "nijhoff book title _", "nijhoff book title _6", "nijhoff book title 16"
"nijhoff ebook title 2006" » "nijhoff book titles 2006", "nijhoff ebook title 20", "nijhoff ebook title 2012", "nijhoff ebook titles 2006", "nijhoff ebook table 2006", "nijhoff ework title 2006", "nijhoff ebook title _006", "nijhoff ebook title 1006"
"nijhoff ebook title 2" » "nijhoff book titles 2", "nijhoff ebook titles 2", "nijhoff ebook table 2", "nijhoff ework title 2", "nijhoff ebook title _", "nijhoff ebook title 1"
"nijhoff ebook title a" » "nijhoff book titles a", "nijhoff ebook titles a", "nijhoff ebook table a", "nijhoff ework title a", "nijhoff ebook title _"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("nijhoff ebook title 2006") OR ((("nijhoff book title 26") OR ((("nijhoff ebook title 2") OR ("nijhoff ebook title a")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nijhoff ebook title 2006\") or (((\"nijhoff book title 26\") or (((\"nijhoff ebook title 2\") OR (\"nijhoff ebook title a\"))))))".
• Removing quotes may allow a broader search: (( nijhoff ebook title 2006 ) or ((( nijhoff book title 26 ) or ((( nijhoff ebook title 2 ) OR ( nijhoff ebook title a )))))).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff ebook title 2006") or ((("nijhoff book title 26") or ((("nijhoff ebook title 2") OR ("nijhoff ebook title a"))))))*.