Perhaps you should try some spelling variations:
"nijhoff boston titles 1" » "nijhoff boston tables 1", "nijhoff boston times 1", "nijhoff boston entitled 1", "nijhoff boston titles _"
"nijhoff book titles 21" » "nijhoff book intitled 21", "nijhoff book tables 21", "nijhoff work titles 21", "nijhoff book times 21", "nijhoff book titles 11", "nijhoff book titles 71", "nijhoff book titles 2.9"
"nijhoff book entitled 21" » "nijhoff book entitled 1", "nijhoff book entitled _", "nijhoff book entitled a"
"nijhoff work titles 21" » "nijhoff works titles 21", "nijhoff work title 21", "nijhoff works title 21", "nijhoff work titles 11", "nijhoff work titles 71", "nijhoff work titles 2.9"
"nijhoff ebook title 2006" » "nijhoff ebook table 2006", "nijhoff ework title 2006", "nijhoff ebook time 2006", "nijhoff ebook title 20", "nijhoff ebook title 2012"
"nijhoff book title 26" » "nijhoff book table 26", "nijhoff work title 26", "nijhoff book time 26", "nijhoff book title 2", "nijhoff book title 21", "nijhoff book title 25"
"nijhoff op tables 21" » "nijhoff _ tables 21", "nijhoff j tables 21", "nijhoff top tables 21", "nijhoff up tables 21", "nijhoff oltp tables 21", "nijhoff op tables 1", "nijhoff op tables 2", "nijhoff op tables 22", "nijhoff oup tables 21", "nijhoff o_ tables 21", "nijhoff oa tables 21"
"nijhoff op tables 11" » "nijhoff _ tables 11", "nijhoff j tables 11", "nijhoff op tables 1", "nijhoff op tables 10", "nijhoff op tables 15", "nijhoff top tables 11", "nijhoff up tables 11", "nijhoff oltp tables 11", "nijhoff oup tables 11", "nijhoff o_ tables 11", "nijhoff oa tables 11"
"nijhoff p tables 21" » "nijhoff _ tables 21", "nijhoff j tables 21", "nijhoff p tables 1", "nijhoff p tables 2", "nijhoff p tables 22", "nijhoff up tables 21", "nijhoff a tables 21"
"nijhoff ebola time 2006" » "nijhoff ebola time 2000", "nijhoff ebola time 2001", "nijhoff ebola time 2004"

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 ebook title 2006") OR ("nijhoff ebola time 2006"))) OR ((((((((((("nijhoff book titles 21") OR ("nijhoff work titles 21"))) OR ((((("nijhoff op tables 21") OR ("nijhoff p tables 21"))) OR ("nijhoff op tables 11"))))) OR ("nijhoff book entitled 21"))) OR ("nijhoff boston titles 1"))) OR ("nijhoff book title 26")))).
• 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 21\") OR (\"nijhoff work titles 21\"))) or (((((\"nijhoff op tables 21\") or (\"nijhoff p tables 21\"))) or (\"nijhoff op tables 11\"))))) or (\"nijhoff book entitled 21\"))) or (\"nijhoff boston titles 1\"))) or (\"nijhoff book title 26\"))))".
• Removing quotes may allow a broader search: (((( nijhoff ebook title 2006 ) or ( nijhoff ebola time 2006 ))) or ((((((((((( nijhoff book titles 21 ) OR ( nijhoff work titles 21 ))) or ((((( nijhoff op tables 21 ) or ( nijhoff p tables 21 ))) or ( nijhoff op tables 11 ))))) or ( nijhoff book entitled 21 ))) or ( nijhoff boston titles 1 ))) or ( nijhoff book title 26 )))).
• Adding a wildcard symbol may retrieve word variants: (((("nijhoff ebook title 2006") or ("nijhoff ebola time 2006"))) or ((((((((((("nijhoff book titles 21") OR ("nijhoff work titles 21"))) or ((((("nijhoff op tables 21") or ("nijhoff p tables 21"))) or ("nijhoff op tables 11"))))) or ("nijhoff book entitled 21"))) or ("nijhoff boston titles 1"))) or ("nijhoff book title 26"))))*.