Perhaps you should try some spelling variations:
"nijhoff boston title 26" » "nijhoff boston entitled 26", "nijhoff boston tables 26", "nijhoff boston twelve 26", "nijhoff boston title 2", "nijhoff boston title 21", "nijhoff boston title 25"
"nijhoff book title 2006" » "nijhoff op title 2006", "nijhoff book titles 2006", "nijhoff ebook title 2006", "nijhoff book table 2006", "nijhoff book title 20", "nijhoff book title 2012"
"nijhoff book title 26" » "nijhoff op title 26", "nijhoff book titles 26", "nijhoff ebook title 26", "nijhoff book table 26", "nijhoff book title 2", "nijhoff book title 21", "nijhoff book title 25"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("nijhoff book title 2006") OR ((("nijhoff book title 26") OR ("nijhoff boston title 26")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nijhoff book title 2006\") or (((\"nijhoff book title 26\") OR (\"nijhoff boston title 26\"))))".
• Removing quotes may allow a broader search: (( nijhoff book title 2006 ) or ((( nijhoff book title 26 ) OR ( nijhoff boston title 26 )))).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff book title 2006") or ((("nijhoff book title 26") OR ("nijhoff boston title 26"))))*.