Perhaps you should try some spelling variations:
"nijhoff book titles 2" » "nijhoff boston titles 2", "nijhoff op titles 2", "nijhoff book entitled 2", "nijhoff book intitled 2", "nijhoff book titles _", "nijhoff book titles 1", "nijhoff book titles a"
"nijhoff book titles 12" » "nijhoff boston titles 12", "nijhoff op titles 12", "nijhoff book entitled 12", "nijhoff book intitled 12", "nijhoff book titles 1", "nijhoff book titles 19", "nijhoff book titles 11"
"nijhoff ebook title 20" » "nijhoff book title 20", "nijhoff ebook title 2", "nijhoff ebook title 10", "nijhoff ebook title 21"
"nijhoff ebook title _" » "nijhoff book title _"

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 20") OR ((("nijhoff book titles 2") OR ("nijhoff book titles 12"))))) OR ("nijhoff ebook title _")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nijhoff ebook title 20\") or (((\"nijhoff book titles 2\") OR (\"nijhoff book titles 12\"))))) or (\"nijhoff ebook title _\"))".
• Removing quotes may allow a broader search: (((( nijhoff ebook title 20 ) or ((( nijhoff book titles 2 ) OR ( nijhoff book titles 12 ))))) or ( nijhoff ebook title _ )).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff ebook title 20") or ((("nijhoff book titles 2") OR ("nijhoff book titles 12"))))) or ("nijhoff ebook title _"))*.