Perhaps you should try some spelling variations:
"nijhoff comp titles 2006" » "nijhoff column titles 2006", "nijhoff forms titles 2006"
"nijhoff op titles 2006" » "nijhoff _ titles 2006", "nijhoff j titles 2006", "nijhoff up titles 2006", "nijhoff job titles 2006"

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