Perhaps you should try some spelling variations:
"a network business book" » "a networks business book", "a network robustness book", "a networks robustness book", "a networld business book", "a netbank business book", "a netnetworks business book"
"a work business book" » "a world business book", "a bank business book", "a networks business book", "a word business book"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"a work business book\") OR (\"a network business book\"))".
• Removing quotes may allow a broader search: (( a work business book ) OR ( a network business book )).
• Adding a wildcard symbol may retrieve word variants: (("a work business book") OR ("a network business book"))*.