Perhaps you should try some spelling variations:
"nijhoff boston title 10" » "nijhoff button title 10", "nijhoff boston entitled 10", "nijhoff boston tables 10", "nijhoff boston title 1", "nijhoff boston title a", "nijhoff boston title 2"
"nijhoff book title 20" » "nijhoff book titles 20", "nijhoff ebook title 20", "nijhoff work title 20", "nijhoff book title 2", "nijhoff book title 25", "nijhoff book title 26"
"nijhoff book title 21" » "nijhoff book titles 21", "nijhoff ebook title 21", "nijhoff work title 21", "nijhoff book title 1", "nijhoff book title 2", "nijhoff book title a"
"nijhoff book title _" » "nijhoff book titles _", "nijhoff ebook title _", "nijhoff work title _"
"nijhoff book title 10" » "nijhoff book titles 10", "nijhoff ebook title 10", "nijhoff work title 10", "nijhoff book title 1", "nijhoff book title a", "nijhoff book title 2"
"nijhoff scpa title 2109" » "nijhoff scpa title 19", "nijhoff scpa title 29", "nijhoff cpa title 2109", "nijhoff jtpa title 2109", "nijhoff scpa title 109", "nijhoff scpa title 209", "nijhoff scpa title a09"
"nijhoff app title 2109" » "nijhoff app title 19", "nijhoff app title 29", "nijhoff a title 2109", "nijhoff app title 109", "nijhoff app title 209", "nijhoff app title a09"
"nijhoff op title 21" » "nijhoff _ title 21", "nijhoff j title 21", "nijhoff op title 1", "nijhoff op title 2", "nijhoff op title a", "nijhoff sop title 21", "nijhoff shop title 21", "nijhoff up titles 21"
"nijhoff book table 2009" » "nijhoff book table 20", "nijhoff book table 2.9", "nijhoff book table 29"

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 book table 2009") OR ((((("nijhoff book title 20") OR ((((("nijhoff book title 21") OR ("nijhoff op title 21"))) OR ("nijhoff book title _"))))) OR ((("nijhoff book title 10") OR ("nijhoff boston title 10"))))))) OR ((("nijhoff scpa title 2109") OR ("nijhoff app title 2109")))).
• Removing quotes may allow a broader search: (((( nijhoff book table 2009 ) or ((((( nijhoff book title 20 ) or ((((( nijhoff book title 21 ) or ( nijhoff op title 21 ))) or ( nijhoff book title _ ))))) or ((( nijhoff book title 10 ) or ( nijhoff boston title 10 ))))))) or ((( nijhoff scpa title 2109 ) or ( nijhoff app title 2109 )))).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff book table 2009") or ((((("nijhoff book title 20") or ((((("nijhoff book title 21") or ("nijhoff op title 21"))) or ("nijhoff book title _"))))) or ((("nijhoff book title 10") or ("nijhoff boston title 10"))))))) or ((("nijhoff scpa title 2109") or ("nijhoff app title 2109"))))*.