Perhaps you should try some spelling variations:
"nijhoff book title 2006" » "nijhoff boston title 2006", "nijhoff op title 2006", "nijhoff book titles 2006", "nijhoff ebook title 2006", "nijhoff book table 2006", "nijhoff book title 26", "nijhoff book title 2012", "nijhoff book title 206", "nijhoff book title 1006", "nijhoff book title 2106"
"nijhoff book title 20" » "nijhoff boston title 20", "nijhoff op title 20", "nijhoff book titles 20", "nijhoff ebook title 20", "nijhoff book table 20", "nijhoff book title 2", "nijhoff book title 10", "nijhoff book title 21"

Try widening your search to All Fields.

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 book title 2006\") OR (\"nijhoff book title 20\"))".
• Removing quotes may allow a broader search: (( nijhoff book title 2006 ) OR ( nijhoff book title 20 )).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff book title 2006") OR ("nijhoff book title 20"))*.