Perhaps you should try some spelling variations:
"nijhoff ebook titles 2006" » "nijhoff book titles 2006", "nijhoff book title 2006", "nijhoff about titles 2006", "nijhoff book titless 2006"
"nijhoff work title 26" » "nijhoff op title 26", "nijhoff work time 26", "nijhoff work entitled 26", "nijhoff work intitled 26", "nijhoff work title 21", "nijhoff work title 25", "nijhoff work title _", "nijhoff work title _6", "nijhoff work title a6", "nijhoff work title 16"
"nijhoff work title 2" » "nijhoff op title 2", "nijhoff work time 2", "nijhoff work entitled 2", "nijhoff work intitled 2", "nijhoff work title _", "nijhoff work title a", "nijhoff work title 1"
"nijhoff ebook title 26" » "nijhoff book title 26", "nijhoff book titles 26", "nijhoff ebook title 21", "nijhoff ebook title 25", "nijhoff ebook title _", "nijhoff ebook title _6", "nijhoff ebook title a6", "nijhoff ebook title 16"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("nijhoff ebook titles 2006") OR ((("nijhoff ebook title 26") OR ((("nijhoff work title 26") OR ("nijhoff work title 2")))))).
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• Adding a wildcard symbol may retrieve word variants: (("nijhoff ebook titles 2006") or ((("nijhoff ebook title 26") or ((("nijhoff work title 26") OR ("nijhoff work title 2"))))))*.