Perhaps you should try some spelling variations:
"nijhoff boston titles 21" » "nijhoff boston tables 21", "nijhoff boston times 21", "nijhoff boston entitled 21", "nijhoff boston titles 1", "nijhoff boston titles 11", "nijhoff boston titles 2.9"
"nijhoff book titles 71" » "nijhoff op titles 71", "nijhoff book entitled 71", "nijhoff book intitled 71", "nijhoff book tables 71", "nijhoff work titles 71", "nijhoff book times 71", "nijhoff book titles 1", "nijhoff book titles 11", "nijhoff book titles 78"
"nijhoff book title 26" » "nijhoff op title 26", "nijhoff book table 26", "nijhoff work title 26", "nijhoff book time 26", "nijhoff book title 21", "nijhoff book title 25", "nijhoff book title _", "nijhoff book title _6", "nijhoff book title a6", "nijhoff book title 16"
"nijhoff book title 16" » "nijhoff op title 16", "nijhoff book table 16", "nijhoff work title 16", "nijhoff book time 16", "nijhoff book title 1", "nijhoff book title 10", "nijhoff book title 17"
"nijhoff book title 2" » "nijhoff op title 2", "nijhoff book table 2", "nijhoff work title 2", "nijhoff book time 2", "nijhoff book title _", "nijhoff book title a", "nijhoff book title 1"
"nijhoff ebook title 2006" » "nijhoff ebook title 20", "nijhoff ebook title 2012", "nijhoff ebook table 2006", "nijhoff ework title 2006", "nijhoff ebook time 2006", "nijhoff ebook title _006", "nijhoff ebook title a006", "nijhoff ebook title 1006"
"nijhoff ebola time 2006" » "nijhoff ebola time 2000", "nijhoff ebola time 2001", "nijhoff ebola time 2004"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nijhoff ebook title 2006") OR ("nijhoff ebola time 2006"))) OR ((((("nijhoff book titles 71") OR ("nijhoff boston titles 21"))) OR ((((("nijhoff book title 26") OR ("nijhoff book title 16"))) OR ("nijhoff book title 2")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nijhoff ebook title 2006\") or (\"nijhoff ebola time 2006\"))) or (((((\"nijhoff book titles 71\") or (\"nijhoff boston titles 21\"))) or (((((\"nijhoff book title 26\") OR (\"nijhoff book title 16\"))) or (\"nijhoff book title 2\"))))))".
• Removing quotes may allow a broader search: (((( nijhoff ebook title 2006 ) or ( nijhoff ebola time 2006 ))) or ((((( nijhoff book titles 71 ) or ( nijhoff boston titles 21 ))) or ((((( nijhoff book title 26 ) OR ( nijhoff book title 16 ))) or ( nijhoff book title 2 )))))).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff ebook title 2006") or ("nijhoff ebola time 2006"))) or ((((("nijhoff book titles 71") or ("nijhoff boston titles 21"))) or ((((("nijhoff book title 26") OR ("nijhoff book title 16"))) or ("nijhoff book title 2"))))))*.