Perhaps you should try some spelling variations:
nijhoff book » nijhoff boston
nijhoff op » nijhoff _, nijhoff j
book title » book titles, ebook title, book table
op title » sop title, shop title, app title
title 26 » title 2, title 25, title _
title 21 » title 1, title 2, title _

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 op title 26 ) OR ( nijhoff book title 21 )).
• Adding a wildcard symbol may retrieve word variants: (( nijhoff op title 26 ) or ( nijhoff book title 21 ))*.