You can search for physical books, e-books and book chapters in LibrarySearch. Login and search in it using search words (keywords) that describe your topic, then refine your results to 'Books' and 'Book chapters' under Resource Type. If you only want online resources (e.g. e-books and online book chapters), further limit your results to 'Online' under Show Only.
Further information: Tips for using LibrarySearch
You can search for the following words in LibrarySearch (not case-sensitive):
The Library's e-Books guide covers everything you need to know about finding and using e-books.