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 work title 20" » "nijhoff work time 20", "nijhoff work entitled 20", "nijhoff work intitled 20", "nijhoff work title 25", "nijhoff work title 26", "nijhoff work title 22", "nijhoff work title a0", "nijhoff work title 10"
"nijhoff book title 21" » "nijhoff book titles 21", "nijhoff ebook title 21", "nijhoff book time 21", "nijhoff book title 1", "nijhoff book title a", "nijhoff book title 17", "nijhoff book title a1", "nijhoff book title 11"
"nijhoff book title _" » "nijhoff book titles _", "nijhoff ebook title _", "nijhoff book time _"
"nijhoff book title 10" » "nijhoff book titles 10", "nijhoff ebook title 10", "nijhoff book time 10", "nijhoff book title 1", "nijhoff book title a"
"nijhoff sop titles 19" » "nijhoff comp titles 19", "nijhoff job titles 19", "nijhoff up titles 19", "nijhoff sop titles 1", "nijhoff sop titles _", "nijhoff sop titles ii", "nijhoff shop titles 19", "nijhoff ship titles 19", "nijhoff sshop titles 19", "nijhoff sup titless 19", "nijhoff scpa titles 19"
"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 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 1709", "nijhoff sop title a109", "nijhoff sop title 1109"
"nijhoff book table 2009" » "nijhoff book table 20", "nijhoff book table 2.9", "nijhoff book table 29"
"nijhoff app title a09" » "nijhoff a title a09", "nijhoff app title a", "nijhoff app title add", "nijhoff app title 9"

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 work 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 sop titles 19"))) OR ("nijhoff app title a09")))).
• Removing quotes may allow a broader search: (((( nijhoff book table 2009 ) or ((((( nijhoff work 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 sop titles 19 ))) or ( nijhoff app title a09 )))).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff book table 2009") or ((((("nijhoff work 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 sop titles 19"))) or ("nijhoff app title a09"))))*.