Perhaps you should try some spelling variations:
"nijhoff book title 2006" » "nijhoff boston title 2006", "nijhoff book titles 2006", "nijhoff ebook title 2006", "nijhoff book table 2006", "nijhoff book title 26", "nijhoff book title 2012", "nijhoff book title 206", "nijhoff book title 1006", "nijhoff book title 2106"
"nijhoff book title 20" » "nijhoff boston title 20", "nijhoff book titles 20", "nijhoff ebook title 20", "nijhoff book table 20", "nijhoff book title 2", "nijhoff book title 10", "nijhoff book title 21"
"nijhoff job titles 2006" » "nijhoff j titles 2006"
"nijhoff op titles 2006" » "nijhoff _ titles 2006", "nijhoff j titles 2006", "nijhoff up titles 2006", "nijhoff comp titles 2006"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nijhoff book title 2006") OR ("nijhoff book title 20"))) OR ((("nijhoff op titles 2006") OR ("nijhoff job titles 2006")))).
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• Adding a wildcard symbol may retrieve word variants: (((("nijhoff book title 2006") or ("nijhoff book title 20"))) or ((("nijhoff op titles 2006") OR ("nijhoff job titles 2006"))))*.