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The University of California's repository now holds over 42,000 dissertations and theses (including more than 10,000 from UCSD), publicly accessible. Some recent titles will be embargoed. You can browse or search the collection.
Search 500,000 UK dissertations, many open access. For those not immediately available for download, you can request digitization by the British Library. Check site for anticipated turnaround time.
ProQuest Dissertations & Theses
ProQuest's Dissertations & Theses(PQDT) is the best starting point for finding dissertations, indexing more than 3.8 million dissertations and theses from 1743 to present, though with greater coverage of dissertations.
UCSD affiliates can download non-embargoed, University of California dissertations from 1996-present and theses from 2008-present, as well as any dissertations/theses made openly available by their respective institutions. If you see Full text - PDF, you can download/print the dissertation or thesis.
If there's an option to Order a copy but no option to download the full PDF, click (or use the interlibrary loan request form) to request a copy of the dissertation. In most cases, you can at least preview the first 24 pages before you decide to submit the request.
If there is no option to order a copy, regardless of institution, then it's likely that the dissertation has been embargoed and not available. Your best option at this point may be to contact the author, their advisor, or look for journal articles and other related works by the author.