The following links will direct you to databases of theses / dissertations. In most cases they are not available full text. If found in South Africa, they are sometimes available via interlibrary loans.
ResearchSpace is the online repository of the University of KwaZulu-Natal. It houses the full text of all new theses issued by the university. In addition, the library is at present involved in a project to digitise all past theses from the university, so many of these are also available full text .
You can go directly to ResearchSpace to search theses by author, title or subject.
If you are accessing ResearchSpace from off campus, it is best to use Firefox.