Perhaps you should try some spelling variations:
nijhoff book » nijhoff boston, nijhoff op
book title » book titles, ebook title, book table
title 20 » title 2, title 10, title 21
title 26 » title 2, title 21, title 25

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 20 ) OR ( nijhoff book title 26 )).
• Adding a wildcard symbol may retrieve word variants: (( nijhoff book title 20 ) or ( nijhoff book title 26 ))*.