Perhaps you should try some spelling variations:
"nijhoff book titles 16" » "nijhoff boston titles 16", "nijhoff op titles 16", "nijhoff book entitled 16", "nijhoff book intitled 16", "nijhoff book titles 1", "nijhoff book titles 19", "nijhoff book titles 11"
"nijhoff ebook title 2006" » "nijhoff book title 2006", "nijhoff ebook title 26", "nijhoff ebook title 20", "nijhoff ebook title 2012", "nijhoff ebook title _006", "nijhoff ebook title a006", "nijhoff ebook title 1006"
"nijhoff ebook title 16" » "nijhoff book title 16", "nijhoff ebook title 1", "nijhoff ebook title 10", "nijhoff ebook title 17"
"nijhoff ebook title 2" » "nijhoff book title 2", "nijhoff ebook title _", "nijhoff ebook title a", "nijhoff ebook title 1"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("nijhoff ebook title 2006") OR ((((("nijhoff ebook title 16") OR ("nijhoff book titles 16"))) OR ("nijhoff ebook title 2")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nijhoff ebook title 2006\") or (((((\"nijhoff ebook title 16\") OR (\"nijhoff book titles 16\"))) or (\"nijhoff ebook title 2\"))))".
• Removing quotes may allow a broader search: (( nijhoff ebook title 2006 ) or ((((( nijhoff ebook title 16 ) OR ( nijhoff book titles 16 ))) or ( nijhoff ebook title 2 )))).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff ebook title 2006") or ((((("nijhoff ebook title 16") OR ("nijhoff book titles 16"))) or ("nijhoff ebook title 2"))))*.