While there is no way to restrict search results to downloadable books only, you can limit your results to books that are fully viewable by using the Advanced Search feature of Google Books. Just select the "Full view only" option, enter your search terms and click "Google Search."
Open Library is a project of the non-profit Internet Archive. The goal is one web page for every book ever published. Not every book listed has a free eBook version, but there are many available through Open Library and you can limit your search to eBooks.
To use this app, it is recommended to have the location feature turned on with your mobile device. From there, select academic as your institution, and you can retrieve the password from Gale by entering your ivy tech email address.