Perhaps you should try some spelling variations:
"nijhoff boston titles 2.9" » "nijhoff boston tables 2.9", "nijhoff boston times 2.9", "nijhoff boston entitled 2.9", "nijhoff boston titles 19", "nijhoff boston titles 3.1", "nijhoff boston titles 3.2"
"nijhoff ebook title 2006" » "nijhoff book titles 2006", "nijhoff ebook title 20", "nijhoff ebook title 2012", "nijhoff ebook titles 2006", "nijhoff ebook table 2006", "nijhoff ework title 2006"
"nijhoff work titles ii" » "nijhoff works titles ii", "nijhoff work title ii", "nijhoff book titles ii", "nijhoff work titles 1"
"nijhoff op titles 26" » "nijhoff _ titles 26", "nijhoff j titles 26", "nijhoff up titles 26", "nijhoff comp titles 26", "nijhoff job titles 26", "nijhoff op titles 1", "nijhoff op titles a", "nijhoff op titles c"
"nijhoff op titles _" » "nijhoff _ titles _", "nijhoff j titles _", "nijhoff up titles _", "nijhoff comp titles _", "nijhoff job titles _"
"nijhoff book title 26" » "nijhoff book titles 26", "nijhoff book table 26", "nijhoff work title 26", "nijhoff book title 2", "nijhoff book title 21", "nijhoff book title 25"

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 ebook title 2006") OR ((((((("nijhoff boston titles 2.9") OR ((("nijhoff op titles 26") OR ("nijhoff op titles _"))))) OR ("nijhoff work titles ii"))) OR ("nijhoff book title 26"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nijhoff ebook title 2006\") or (((((((\"nijhoff boston titles 2.9\") or (((\"nijhoff op titles 26\") OR (\"nijhoff op titles _\"))))) or (\"nijhoff work titles ii\"))) or (\"nijhoff book title 26\"))))*".
• Removing quotes may allow a broader search: (( nijhoff ebook title 2006 ) or ((((((( nijhoff boston titles 2.9 ) or ((( nijhoff op titles 26 ) OR ( nijhoff op titles _ ))))) or ( nijhoff work titles ii ))) or ( nijhoff book title 26 ))))*.