Perhaps you should try some spelling variations:
"nijhoff book titles 2006" » "nijhoff boston titles 2006", "nijhoff op titles 2006", "nijhoff book entitled 2006", "nijhoff book intitled 2006", "nijhoff book tables 2006", "nijhoff work titles 2006", "nijhoff book times 2006"
"nijhoff book title _" » "nijhoff boston title _", "nijhoff op title _", "nijhoff book table _", "nijhoff work title _", "nijhoff book time _"
"nijhoff app title 26" » "nijhoff op title 26", "nijhoff a title 26", "nijhoff app title 2", "nijhoff app title 21", "nijhoff app title 25"
"nijhoff ebook title _" » "nijhoff ebook table _", "nijhoff ework title _", "nijhoff ebook time _"

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