Perhaps you should try some spelling variations:
"nijhoff ebook titles 2006" » "nijhoff about titles 2006", "nijhoff work titles 2006", "nijhoff ebook entitled 2006", "nijhoff ebook intitled 2006", "nijhoff ebook tables 2006", "nijhoff ework titles 2006", "nijhoff ebook times 2006"
"nijhoff book titles 26" » "nijhoff boston titles 26", "nijhoff op titles 26", "nijhoff book entitled 26", "nijhoff book intitled 26", "nijhoff book tables 26", "nijhoff work titles 26", "nijhoff book times 26", "nijhoff book titles 2.9", "nijhoff book titles _", "nijhoff book titles 1"
"nijhoff book title 26" » "nijhoff boston title 26", "nijhoff op title 26", "nijhoff book table 26", "nijhoff work title 26", "nijhoff book time 26", "nijhoff book title 2", "nijhoff book title 21", "nijhoff book title 25"
"nijhoff ebook title 26" » "nijhoff ebook table 26", "nijhoff ework title 26", "nijhoff ebook time 26", "nijhoff ebook title 2", "nijhoff ebook title 21", "nijhoff ebook title 25"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("nijhoff ebook titles 2006") OR ((((("nijhoff ebook title 26") OR ("nijhoff book titles 26"))) OR ("nijhoff book title 26")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nijhoff ebook titles 2006\") or (((((\"nijhoff ebook title 26\") OR (\"nijhoff book titles 26\"))) or (\"nijhoff book title 26\"))))".
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• Adding a wildcard symbol may retrieve word variants: (("nijhoff ebook titles 2006") or ((((("nijhoff ebook title 26") OR ("nijhoff book titles 26"))) or ("nijhoff book title 26"))))*.