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 2", "nijhoff book title 21", "nijhoff book title 25"
"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 _" » "nijhoff book titles _", "nijhoff ebook titles _", "nijhoff ebook table _", "nijhoff ework title _"
"nijhoff app title 26" » "nijhoff op title 26", "nijhoff a title 26", "nijhoff app title 2", "nijhoff app title 21", "nijhoff app title 25"

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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 app title 26"))) OR ("nijhoff ebook title _")))).
• Removing quotes may allow a broader search: (( nijhoff ebook title 2006 ) or ((((( nijhoff book title 26 ) or ( nijhoff app title 26 ))) or ( nijhoff ebook title _ )))).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff ebook title 2006") or ((((("nijhoff book title 26") or ("nijhoff app title 26"))) or ("nijhoff ebook title _"))))*.