Perhaps you should try some spelling variations:
book entitleds » book entituled, book intitled, book entitl'd
work titles » works titles, work title, works title
ebook title » book title
book titles » book intitled

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 ((((((book entitleds) OR (work titles))) OR (((ebook title) OR (book titles))))) OR (book entitled)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nijhoff ((((((book entitleds) or (work titles))) or (((ebook title) OR (book titles))))) or (book entitled))".
• Adding a wildcard symbol may retrieve word variants: nijhoff ((((((book entitleds) or (work titles))) or (((ebook title) OR (book titles))))) or (book entitled))*.