Perhaps you should try some spelling variations:
"nijhoff book titles 3.1" » "nijhoff boston titles 3.1", "nijhoff op titles 3.1", "nijhoff book intitled 3.1", "nijhoff book titles 3.2", "nijhoff book titles 1", "nijhoff book titles 11"
"nijhoff book entitled mr" » "nijhoff boston entitled mr", "nijhoff op entitled mr", "nijhoff book entitled _", "nijhoff book entitled a", "nijhoff book entitled free"
"nijhoff ebook title 25" » "nijhoff book title 25", "nijhoff ebook title 2", "nijhoff ebook title 21", "nijhoff ebook title 5"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nijhoff book titles 3.1") OR ("nijhoff book entitled mr"))) OR ("nijhoff ebook title 25")).
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