Perhaps you should try some spelling variations:
"nijhoff book title _" » "nijhoff boston title _", "nijhoff op title _", "nijhoff book titles _", "nijhoff book table _", "nijhoff work title _"
"nijhoff ework title 20" » "nijhoff work title 20", "nijhoff work titles 20", "nijhoff works title 20", "nijhoff ework title 10", "nijhoff ework title 21", "nijhoff ework title 25", "nijhoff ework title a0", "nijhoff ework title he0"
"nijhoff ebook title 2" » "nijhoff book titles 2", "nijhoff ebook titles 2", "nijhoff ebook table 2", "nijhoff ework title 2", "nijhoff ebook title a", "nijhoff ebook title 1", "nijhoff ebook title he"
"nijhoff ebook title _" » "nijhoff book titles _", "nijhoff ebook titles _", "nijhoff ebook table _", "nijhoff ework title _"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nijhoff ework title 20") OR ("nijhoff ebook title 2"))) OR ((("nijhoff ebook title _") OR ("nijhoff book title _")))).
• Removing quotes may allow a broader search: (((( nijhoff ework title 20 ) or ( nijhoff ebook title 2 ))) or ((( nijhoff ebook title _ ) or ( nijhoff book title _ )))).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff ework title 20") or ("nijhoff ebook title 2"))) or ((("nijhoff ebook title _") or ("nijhoff book title _"))))*.