Perhaps you should try some spelling variations:
"nijhoff book time 26" » "nijhoff boston time 26", "nijhoff op time 26", "nijhoff book tips 26", "nijhoff book time 2.6", "nijhoff book time 2", "nijhoff book time 16"
"nijhoff book table 26" » "nijhoff boston table 26", "nijhoff op table 26", "nijhoff book table 2.6", "nijhoff book tables 26", "nijhoff book table 2"
"nijhoff ework title 2006" » "nijhoff work title 2006", "nijhoff work titles 2006", "nijhoff works title 2006", "nijhoff ework title 26", "nijhoff ework title 20", "nijhoff ework title 2012"
"nijhoff ebook title _" » "nijhoff book title _", "nijhoff book titles _"

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