Perhaps you should try some spelling variations:
"nijhoff book intitled 26" » "nijhoff book intituled 26", "nijhoff book entitled 26", "nijhoff boston intitled 26", "nijhoff book intitled _", "nijhoff book intitled a", "nijhoff book intitled de"
"nijhoff ebook title 20" » "nijhoff book title 20", "nijhoff book titles 20", "nijhoff ebook title 2", "nijhoff ebook title 10", "nijhoff ebook title 21"
"nijhoff op titles 26" » "nijhoff _ titles 26", "nijhoff j titles 26", "nijhoff up titles 26", "nijhoff comp titles 26", "nijhoff job titles 26", "nijhoff op titles 2.9", "nijhoff op titles _", "nijhoff op titles 1"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("nijhoff ebook title 20") OR ((("nijhoff book intitled 26") OR ("nijhoff op titles 26")))).
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