Perhaps you should try some spelling variations:
"nijhoff book titles 26" » "nijhoff boston titles 26", "nijhoff op titles 26", "nijhoff book entitled 26", "nijhoff book intitled 26", "nijhoff book titles 2.9", "nijhoff book titles _", "nijhoff book titles 1"
"nijhoff ebook title _" » "nijhoff book title _"
"nijhoff ebook title 21" » "nijhoff book title 21", "nijhoff ebook title 1", "nijhoff ebook title 2", "nijhoff ebook title a"

Try widening your search to All Fields.

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 _") OR ("nijhoff ebook title 21"))) OR ("nijhoff book titles 26")).
• Removing quotes may allow a broader search: (((( nijhoff ebook title _ ) or ( nijhoff ebook title 21 ))) or ( nijhoff book titles 26 )).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff ebook title _") or ("nijhoff ebook title 21"))) or ("nijhoff book titles 26"))*.