Perhaps you should try some spelling variations:
"nijhoff book title 2012" » "nijhoff boston title 2012", "nijhoff op title 2012", "nijhoff ebook title 2012", "nijhoff book table 2012", "nijhoff work title 2012", "nijhoff book title 21", "nijhoff book title 12", "nijhoff book title 22", "nijhoff book title 212", "nijhoff book title 1012", "nijhoff book title 2112"
"nijhoff book title 20" » "nijhoff boston title 20", "nijhoff op title 20", "nijhoff ebook title 20", "nijhoff book table 20", "nijhoff work title 20", "nijhoff book title 2", "nijhoff book title 10", "nijhoff book title 21"
"nijhoff book titles 2006" » "nijhoff boston titles 2006", "nijhoff op titles 2006", "nijhoff book entitled 2006", "nijhoff book intitled 2006", "nijhoff ebook titles 2006", "nijhoff book tables 2006", "nijhoff work titles 2006"

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