Perhaps you should try some spelling variations:
"nijhoff book titles 26" » "nijhoff boston titles 26", "nijhoff op titles 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 entitled 26" » "nijhoff boston entitled 26", "nijhoff op entitled 26", "nijhoff book entitled _", "nijhoff book entitled a", "nijhoff book entitled mr"
"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 2006" » "nijhoff ebook title 20", "nijhoff ebook title 2012", "nijhoff ebook table 2006", "nijhoff ework title 2006", "nijhoff ebook time 2006"

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 26") OR ("nijhoff book entitled 26"))) OR ("nijhoff book title 26")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nijhoff ebook title 2006\") or (((((\"nijhoff book titles 26\") OR (\"nijhoff book entitled 26\"))) or (\"nijhoff book title 26\"))))".
• Removing quotes may allow a broader search: (( nijhoff ebook title 2006 ) or ((((( nijhoff book titles 26 ) OR ( nijhoff book entitled 26 ))) or ( nijhoff book title 26 )))).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff ebook title 2006") or ((((("nijhoff book titles 26") OR ("nijhoff book entitled 26"))) or ("nijhoff book title 26"))))*.