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 a", "nijhoff book title a6", "nijhoff book title 16"
"nijhoff book title 2" » "nijhoff boston title 2", "nijhoff op title 2", "nijhoff book titles 2", "nijhoff book table 2", "nijhoff work title 2", "nijhoff book title a", "nijhoff book title 1"
"nijhoff ework title 2006" » "nijhoff work title 2006", "nijhoff work titles 2006", "nijhoff works title 2006", "nijhoff ework title 2012", "nijhoff ework title 1006", "nijhoff ework title 2106", "nijhoff ework title 2506", "nijhoff ework title a006"
"nijhoff ework title 20" » "nijhoff work title 20", "nijhoff work titles 20", "nijhoff works title 20", "nijhoff ework title 10", "nijhoff ework title 21", "nijhoff ework title 25", "nijhoff ework title a0"
"nijhoff ebook title _" » "nijhoff book titles _", "nijhoff ebook titles _", "nijhoff ebook table _", "nijhoff ework title _"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nijhoff ework title 2006") OR ("nijhoff ework title 20"))) OR ((((("nijhoff book title 26") OR ("nijhoff book title 2"))) OR ("nijhoff ebook title _")))).
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