Perhaps you should try some spelling variations:
"nijhoff boston untitled 2001" » "nijhoff boston entitled 2001", "nijhoff boston entituled 2001", "nijhoff boston united 2001", "nijhoff boston untitled 2"
"nijhoff boston titles 2006" » "nijhoff boston tables 2006", "nijhoff boston times 2006", "nijhoff boston entitled 2006"

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 boston titles 2006") OR ("nijhoff boston untitled 2001")).
• Removing quotes may allow a broader search: (( nijhoff boston titles 2006 ) or ( nijhoff boston untitled 2001 )).
• Adding a wildcard symbol may retrieve word variants: (("nijhoff boston titles 2006") or ("nijhoff boston untitled 2001"))*.