Perhaps you should try some spelling variations:
"nijhoff sermon entituled 2006" » "nijhoff sermon entitled 2006"
"nijhoff boston entitled 60" » "nijhoff boston entituled 60", "nijhoff book entitled 60", "nijhoff boston entitled 10", "nijhoff boston entitled _", "nijhoff boston entitled a"

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 sermon entituled 2006") OR ("nijhoff boston entitled 60")).
• Removing quotes may allow a broader search: (( nijhoff sermon entituled 2006 ) or ( nijhoff boston entitled 60 )).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff sermon entituled 2006") or ("nijhoff boston entitled 60"))*.