Perhaps you should try some spelling variations:
"nijhoff boston title _0" » "nijhoff button title _0", "nijhoff boston entitled _0", "nijhoff boston tables _0", "nijhoff boston title _", "nijhoff boston title 10", "nijhoff boston title 20"
"nijhoff book titles 16" » "nijhoff op titles 16", "nijhoff book entitled 16", "nijhoff book intitled 16", "nijhoff book titles 1", "nijhoff book titles 19", "nijhoff book titles 11"
"nijhoff ebook title 2" » "nijhoff book title 2", "nijhoff ebook title _", "nijhoff ebook title a", "nijhoff ebook title 1"
"nijhoff ebook title 16" » "nijhoff book title 16", "nijhoff ebook title 1", "nijhoff ebook title 10", "nijhoff ebook title 17"

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 boston title _0") OR ("nijhoff ebook title 2"))) OR ((("nijhoff ebook title 16") OR ("nijhoff book titles 16")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nijhoff boston title _0\") or (\"nijhoff ebook title 2\"))) or (((\"nijhoff ebook title 16\") OR (\"nijhoff book titles 16\"))))".
• Removing quotes may allow a broader search: (((( nijhoff boston title _0 ) or ( nijhoff ebook title 2 ))) or ((( nijhoff ebook title 16 ) OR ( nijhoff book titles 16 )))).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff boston title _0") or ("nijhoff ebook title 2"))) or ((("nijhoff ebook title 16") OR ("nijhoff book titles 16"))))*.