Try other search engines!
Web search engines search the open/free web - but not deep in the library databases. (Sometimes you can get to a full-text article in one of the databases through a search engine because you are coming in through an NJIT connection, and you get our "institutional access.") When off campus, always check for articles and books through the library homepage where you can authenticate with your UCID for 'library' access, or use Interlibrary Loan to request books and articles the library doesn't own.