Perhaps you should try some spelling variations:
"nijhoff book title 2006" » "nijhoff op title 2006", "nijhoff ebook title 2006", "nijhoff book table 2006", "nijhoff work title 2006", "nijhoff book title 26", "nijhoff book title 2012", "nijhoff book title 206", "nijhoff book title 1006", "nijhoff book title 2106"
"nijhoff book 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"
"nijhoff boston title 20" » "nijhoff boston entitled 20", "nijhoff boston tables 20", "nijhoff boston twelve 20", "nijhoff boston title 2", "nijhoff boston title 10", "nijhoff boston title 21"

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