Why search here? You want to read graduate student dissertations and theses on a topic - often giving you extensive bibliographies, and occasionally cutting edge research on new topics.
What's included? Index of doctoral dissertations and some master's theses from most North American and many European colleges and universities. Starts in 1743. Full text is available for over 1 million, mostly since 1996.
Pro tip: if your results are overwhelming and not as focused as you want, choose "Modify Search" and then change the search from "Anywhere" to "Anywhere except full text." This will just search the citation, subject terms, and abstract/summary for your words.