Perhaps you should try some spelling variations:
"nijhoff boston titles 21" » "nijhoff boston tables 21", "nijhoff boston times 21", "nijhoff boston entitled 21", "nijhoff boston titles 1", "nijhoff boston titles 11", "nijhoff boston titles 71"
"nijhoff book titles 21" » "nijhoff op titles 21", "nijhoff book entitled 21", "nijhoff book intitled 21", "nijhoff ebook titles 21", "nijhoff book tables 21", "nijhoff work titles 21", "nijhoff book titles 1", "nijhoff book titles 11", "nijhoff book titles 71"
"nijhoff book title 26" » "nijhoff op title 26", "nijhoff ebook title 26", "nijhoff book table 26", "nijhoff work title 26", "nijhoff book title 2", "nijhoff book title 21", "nijhoff book title 25"
"nijhoff ework title 2006" » "nijhoff work title 2006", "nijhoff ebook title 2006", "nijhoff work titles 2006", "nijhoff ework title 20", "nijhoff ework title 2012"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("nijhoff ework title 2006") OR ((((("nijhoff book titles 21") OR ("nijhoff boston titles 21"))) OR ("nijhoff book title 26")))).
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• Adding a wildcard symbol may retrieve word variants: (("nijhoff ework title 2006") or ((((("nijhoff book titles 21") or ("nijhoff boston titles 21"))) or ("nijhoff book title 26"))))*.