Perhaps you should try some spelling variations:
"nijhoff book title 2006" » "nijhoff boston title 2006", "nijhoff book titles 2006", "nijhoff ebook title 2006", "nijhoff book table 2006", "nijhoff book title 26", "nijhoff book title 20"
"nijhoff book title 2012" » "nijhoff boston title 2012", "nijhoff book titles 2012", "nijhoff ebook title 2012", "nijhoff book table 2012", "nijhoff book title 21", "nijhoff book title 12", "nijhoff book title 20"
"nijhoff op titles 2006" » "nijhoff _ titles 2006", "nijhoff j titles 2006", "nijhoff up titles 2006", "nijhoff comp titles 2006", "nijhoff job titles 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 book title 2006") OR ("nijhoff book title 2012"))) OR ("nijhoff op titles 2006")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nijhoff book title 2006\") OR (\"nijhoff book title 2012\"))) or (\"nijhoff op titles 2006\"))".
• Removing quotes may allow a broader search: (((( nijhoff book title 2006 ) OR ( nijhoff book title 2012 ))) or ( nijhoff op titles 2006 )).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff book title 2006") OR ("nijhoff book title 2012"))) or ("nijhoff op titles 2006"))*.