Perhaps you should try some spelling variations:
"nijhoff work title 2009" » "nijhoff op title 2009", "nijhoff work entitled 2009", "nijhoff work intitled 2009", "nijhoff working title 2009", "nijhoff work title 20", "nijhoff work title 29"
"nijhoff work time 2009" » "nijhoff op time 2009", "nijhoff working time 2009", "nijhoff network time 2009", "nijhoff work aime 2009", "nijhoff work time 2000", "nijhoff work time 2001"
"nijhoff ebook title 2012" » "nijhoff book title 2012", "nijhoff book titles 2012", "nijhoff ebook title 21", "nijhoff ebook title 12", "nijhoff ebook title 20"

Try widening your search to All Fields.

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