A digital library is a machine readable representation of materials, which might be found in conventional library. Along with this representation, organizing information is also available to assist users in finding specific information. It also says that digital libraries as a means of knowledge transmission in an electronic medium represent a significant paradigm shift from information to be get from paper books in [1], major characteristics of digital library are variety of digital information resources, digital library reduces the need for physical space, users at remote, users may build their own personal collection by the facilities provided digital library, provide access to distributed information resources, same information resources can be shared by many at the same time, paradigm shift both in use and ownership, ability to handle multilingual content and collection development be based on potential usefulness and appropriate filtering mechanism be followed to negotiate the problem of plenty. Thus, the searching for information sources in the digital library applies the same concept in the enterprise search engine where it process and retrieve the variety of academic theses in the digital library.