Perhaps you should try some spelling variations:
"nijhoff boston title 10" » "nijhoff boston entitled 10", "nijhoff boston tables 10", "nijhoff boston twelve 10", "nijhoff boston title 1", "nijhoff boston title a", "nijhoff boston title he"
"nijhoff book title 20" » "nijhoff book titles 20", "nijhoff ebook title 20", "nijhoff work title 20", "nijhoff book title 25", "nijhoff book title 26", "nijhoff book title 22", "nijhoff book title a0", "nijhoff book title 10", "nijhoff book title he0"
"nijhoff book title 21" » "nijhoff book titles 21", "nijhoff ebook title 21", "nijhoff work title 21", "nijhoff book title 1", "nijhoff book title a", "nijhoff book title he", "nijhoff book title a1", "nijhoff book title 11", "nijhoff book title he1"
"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 he"
"nijhoff sop title 2109" » "nijhoff sop title 19", "nijhoff sop title 29", "nijhoff shop title 2109", "nijhoff ship title 2109", "nijhoff sshop title 2109", "nijhoff sup titles 2109", "nijhoff scpa title 2109", "nijhoff sop title 109", "nijhoff sop title a09", "nijhoff sop title he09", "nijhoff sop title a109", "nijhoff sop title 1109", "nijhoff sop title he109"
"nijhoff op title 2" » "nijhoff _ title 2", "nijhoff j title 2", "nijhoff shop title 2", "nijhoff up titles 2", "nijhoff cpa title 2", "nijhoff op title a", "nijhoff op title 1", "nijhoff op title he"
"nijhoff book table 2009" » "nijhoff book table 20", "nijhoff book table 2.9", "nijhoff book table 29"
"nijhoff app title a09" » "nijhoff app title a", "nijhoff app title 9", "nijhoff app title 19", "nijhoff a title a09"
"nijhoff app title add" » "nijhoff a title add", "nijhoff app title a"

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 2"))) OR ("nijhoff book title _"))))) OR ((("nijhoff book title 10") OR ("nijhoff boston title 10"))))))) OR ((("nijhoff sop title 2109") OR ((("nijhoff app title a09") OR ("nijhoff app title add")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nijhoff book table 2009\") or (((((\"nijhoff book title 20\") or (((((\"nijhoff book title 21\") or (\"nijhoff op title 2\"))) or (\"nijhoff book title _\"))))) or (((\"nijhoff book title 10\") or (\"nijhoff boston title 10\"))))))) or (((\"nijhoff sop title 2109\") or (((\"nijhoff app title a09\") OR (\"nijhoff app title add\"))))))".
• 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 2 ))) or ( nijhoff book title _ ))))) or ((( nijhoff book title 10 ) or ( nijhoff boston title 10 ))))))) or ((( nijhoff sop title 2109 ) or ((( nijhoff app title a09 ) OR ( nijhoff app title add )))))).
• 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 2"))) or ("nijhoff book title _"))))) or ((("nijhoff book title 10") or ("nijhoff boston title 10"))))))) or ((("nijhoff sop title 2109") or ((("nijhoff app title a09") OR ("nijhoff app title add"))))))*.