Search all Theses online Is there a way to search all openly published theses online?

Maybe there is a way for Google Scholar to ignore other types of articles?

I am aware of SCOPUS and Web of Knowledge, but unfortunately I do not have access to these services.

Edit: I talked to my librarian and we found a service called EThOS and additionally a service called openthesis.  Openthesis requires people to upload submissions, which would cover nowhere near as many as Google has indexed.  EthOS is for the UK only.
The only thing I can think of given the lack of other details is this They claim to be "the world's most comprehensive collection of dissertations and theses." While that is not "ALL", it certainly is "MOST"?