Perhaps you should try some spelling variations:
"nijhoff book entitled 2006" » "nijhoff book untitled 2001", "nijhoff book entitled 60", "nijhoff boston entitled 2006", "nijhoff op entitled 2006"
"nijhoff book entitled 10" » "nijhoff boston entitled 10", "nijhoff op entitled 10", "nijhoff book entitled 1", "nijhoff book entitled 60", "nijhoff book entitled _"

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 entitled 2006\") OR (\"nijhoff book entitled 10\"))".
• Removing quotes may allow a broader search: (( nijhoff book entitled 2006 ) OR ( nijhoff book entitled 10 )).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff book entitled 2006") OR ("nijhoff book entitled 10"))*.