Dissertations can be valuable sources of information for your research, though a little tricky to find. Start with the database Dissertations & Theses, which indexes dissertations (and master's level theses) across the academic disciplines. For recent (1997+) dissertations written at a University of California campus, you will be able to find and download complete texts. For other universities, you will be able to view an abstract and substantial preview for recent dissertations. If the title you need isn't available online, you may be able to borrow it via interlibrary loan.
Ph.D. dissertations fom the UCSD Department of Anthropology, 2009+ Open access to 24 page previews online. UCSD access only to complete texts.