Perhaps you should try some spelling variations:
"nijhoff book titles 1" » "nijhoff boston titles 1", "nijhoff op titles 1", "nijhoff book entitled 1", "nijhoff book intitled 1", "nijhoff book titles _"
"nijhoff ebook title 10" » "nijhoff book title 10", "nijhoff ebook title 1", "nijhoff ebook title _", "nijhoff ebook title a"
"nijhoff ebook title 21" » "nijhoff book title 21", "nijhoff ebook title 1", "nijhoff ebook title 2", "nijhoff ebook title _"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nijhoff ebook title 10") OR ("nijhoff book titles 1"))) OR ("nijhoff ebook title 21")).
• Removing quotes may allow a broader search: (((( nijhoff ebook title 10 ) or ( nijhoff book titles 1 ))) or ( nijhoff ebook title 21 )).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff ebook title 10") or ("nijhoff book titles 1"))) or ("nijhoff ebook title 21"))*.