Perhaps you should try some spelling variations:
"nijhoff book title 26" » "nijhoff boston title 26", "nijhoff op title 26", "nijhoff book titles 26", "nijhoff work title 26", "nijhoff book time 26", "nijhoff book title 2", "nijhoff book title 21", "nijhoff book title 25"
"nijhoff book table 26" » "nijhoff boston table 26", "nijhoff op table 26", "nijhoff book table 2.6", "nijhoff book tables 26", "nijhoff book table 2"
"nijhoff ework title 2006" » "nijhoff work title 2006", "nijhoff work titles 2006", "nijhoff works title 2006", "nijhoff ework title 20", "nijhoff ework title 2012"
"nijhoff ebook title _" » "nijhoff book titles _", "nijhoff ebook titles _", "nijhoff ework title _", "nijhoff ebook time _"

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