Perhaps you should try some spelling variations:
"nijhoff book titles 2006" » "nijhoff boston titles 2006", "nijhoff op titles 2006", "nijhoff book entitled 2006", "nijhoff book intitled 2006", "nijhoff book tables 2006", "nijhoff book times 2006", "nijhoff book entitleds 2006"
"nijhoff book title a" » "nijhoff boston title a", "nijhoff op title a", "nijhoff book table a", "nijhoff book time a", "nijhoff book entitled a"
"nijhoff book title _" » "nijhoff boston title _", "nijhoff op title _", "nijhoff book table _", "nijhoff book time _", "nijhoff book entitled _"
"nijhoff work title _" » "nijhoff op title _", "nijhoff work time _", "nijhoff work entitled _", "nijhoff work intitled _"
"nijhoff ebook title 2006" » "nijhoff ebook title 26", "nijhoff ebook title 20", "nijhoff ebook title 2012", "nijhoff ebook table 2006", "nijhoff ebook time 2006", "nijhoff ebook entitled 2006", "nijhoff ebook title 1006"
"nijhoff ebook title 2" » "nijhoff ebook table 2", "nijhoff ebook time 2", "nijhoff ebook entitled 2", "nijhoff ebook title 1"

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 ebook title 2006") OR ("nijhoff book titles 2006"))) OR ((((("nijhoff book title a") OR ((("nijhoff book title _") OR ("nijhoff work title _"))))) OR ("nijhoff ebook title 2")))).
• Removing quotes may allow a broader search: (((( nijhoff ebook title 2006 ) or ( nijhoff book titles 2006 ))) or ((((( nijhoff book title a ) or ((( nijhoff book title _ ) or ( nijhoff work title _ ))))) or ( nijhoff ebook title 2 )))).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff ebook title 2006") or ("nijhoff book titles 2006"))) or ((((("nijhoff book title a") or ((("nijhoff book title _") or ("nijhoff work title _"))))) or ("nijhoff ebook title 2"))))*.