Perhaps you should try some spelling variations:
"nijhoff book titles 20" » "nijhoff boston titles 20", "nijhoff book entitled 20", "nijhoff book intitled 20", "nijhoff book titles 60", "nijhoff book titles 2.9", "nijhoff book titles _"
"nijhoff ebook title 2009" » "nijhoff book title 2009", "nijhoff ebook title 20", "nijhoff ebook title 29"
"nijhoff ebook title 2012" » "nijhoff book title 2012", "nijhoff ebook title 21", "nijhoff ebook title 12", "nijhoff ebook title 20"
"nijhoff op title 2009" » "nijhoff op title 20", "nijhoff op title 29", "nijhoff _ title 2009", "nijhoff j title 2009", "nijhoff sop title 2009", "nijhoff shop title 2009", "nijhoff job title 2009"

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 2009") OR ("nijhoff ebook title 2012"))) OR ("nijhoff book titles 20"))) OR ("nijhoff op title 2009")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"nijhoff ebook title 2009\") OR (\"nijhoff ebook title 2012\"))) or (\"nijhoff book titles 20\"))) or (\"nijhoff op title 2009\"))".
• Removing quotes may allow a broader search: (((((( nijhoff ebook title 2009 ) OR ( nijhoff ebook title 2012 ))) or ( nijhoff book titles 20 ))) or ( nijhoff op title 2009 )).
• Adding a wildcard symbol may retrieve word variants: (((((("nijhoff ebook title 2009") OR ("nijhoff ebook title 2012"))) or ("nijhoff book titles 20"))) or ("nijhoff op title 2009"))*.