Perhaps you should try some spelling variations:
"nijhoff op title 2" » "nijhoff _ title 2", "nijhoff j title 2", "nijhoff shop title 2", "nijhoff app title 2", "nijhoff up titles 2", "nijhoff op title _", "nijhoff op title 1"
"nijhoff sop title a" » "nijhoff shop title a", "nijhoff ship title a", "nijhoff app title a", "nijhoff sshop title a", "nijhoff sapp title a", "nijhoff sup titles a", "nijhoff sop title _"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("nijhoff op title 2") OR ("nijhoff sop title a")).
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