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 2006" » "nijhoff book title 2006", "nijhoff ebook title 26", "nijhoff ebook title 20", "nijhoff ebook title 2012"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nijhoff ebook title 2006\") OR (\"nijhoff book titles 26\"))".
• Removing quotes may allow a broader search: (( nijhoff ebook title 2006 ) OR ( nijhoff book titles 26 )).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff ebook title 2006") OR ("nijhoff book titles 26"))*.