Perhaps you should try some spelling variations:
"nijhoff book title 26" » "nijhoff boston title 26", "nijhoff op title 26", "nijhoff book titles 26", "nijhoff book table 26", "nijhoff work title 26", "nijhoff book title 2", "nijhoff book title 25", "nijhoff book title a"
"nijhoff book title 21" » "nijhoff boston title 21", "nijhoff op title 21", "nijhoff book titles 21", "nijhoff book table 21", "nijhoff work title 21", "nijhoff book title 1", "nijhoff book title 2", "nijhoff book title a"
"nijhoff ework title 2006" » "nijhoff work title 2006", "nijhoff work titles 2006", "nijhoff works title 2006", "nijhoff ework title 2012", "nijhoff ework title 206", "nijhoff ework title 1006", "nijhoff ework title 2506"
"nijhoff ework title 20" » "nijhoff work title 20", "nijhoff work titles 20", "nijhoff works title 20", "nijhoff ework title 2", "nijhoff ework title 10", "nijhoff ework title 25"
"nijhoff ebook title _" » "nijhoff book titles _", "nijhoff ebook titles _", "nijhoff ebook table _", "nijhoff ework 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 ework title 2006") OR ("nijhoff ework title 20"))) OR ((((("nijhoff book title 26") OR ("nijhoff book title 21"))) OR ("nijhoff ebook title _")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nijhoff ework title 2006\") OR (\"nijhoff ework title 20\"))) or (((((\"nijhoff book title 26\") or (\"nijhoff book title 21\"))) or (\"nijhoff ebook title _\"))))".
• Removing quotes may allow a broader search: (((( nijhoff ework title 2006 ) OR ( nijhoff ework title 20 ))) or ((((( nijhoff book title 26 ) or ( nijhoff book title 21 ))) or ( nijhoff ebook title _ )))).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff ework title 2006") OR ("nijhoff ework title 20"))) or ((((("nijhoff book title 26") or ("nijhoff book title 21"))) or ("nijhoff ebook title _"))))*.