Perhaps you should try some spelling variations:
"nijhoff book title _0" » "nijhoff boston title _0", "nijhoff op title _0", "nijhoff book titles _0", "nijhoff book table _0", "nijhoff work title _0", "nijhoff book title _", "nijhoff book title 10", "nijhoff book title 20"
"nijhoff ebook title 2" » "nijhoff book titles 2", "nijhoff ebook titles 2", "nijhoff ebook table 2", "nijhoff ework title 2", "nijhoff ebook title _", "nijhoff ebook title a", "nijhoff ebook title 1"
"nijhoff ebook title 21" » "nijhoff book titles 21", "nijhoff ebook titles 21", "nijhoff ebook table 21", "nijhoff ework title 21", "nijhoff ebook title 1", "nijhoff ebook title _", "nijhoff ebook title a", "nijhoff ebook title _1", "nijhoff ebook title a1", "nijhoff ebook title 11"
"nijhoff ebook title _1" » "nijhoff book titles _1", "nijhoff ebook titles _1", "nijhoff ebook table _1", "nijhoff ework title _1", "nijhoff ebook title _", "nijhoff ebook title 1", "nijhoff ebook title 31"

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 book title _0") OR ("nijhoff ebook title 2"))) OR ((("nijhoff ebook title 21") OR ("nijhoff ebook title _1")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nijhoff book title _0\") or (\"nijhoff ebook title 2\"))) or (((\"nijhoff ebook title 21\") OR (\"nijhoff ebook title _1\"))))".
• Removing quotes may allow a broader search: (((( nijhoff book title _0 ) or ( nijhoff ebook title 2 ))) or ((( nijhoff ebook title 21 ) OR ( nijhoff ebook title _1 )))).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff book title _0") or ("nijhoff ebook title 2"))) or ((("nijhoff ebook title 21") OR ("nijhoff ebook title _1"))))*.