Virginia Tech's ETDs are available in VTechWorks, the university’s digital repository.
There many institutional repositories and national libraries of ETDs, as well as commercial vendors:
Virginia Tech Theses and Dissertations
Can't find that VT ETD you're looking for in VTechWorks? The author may have requested an embargo. If so, the ETD will not be available to the public until the embargo period has expired, usually one year plus a few months.
Can't access the VT ETD you found in VTechWorks? Perhaps the author restricted access to the Virginia Tech community. It will usually become publicly available one year plus a few months after it was approved by the Graduate School. You may request the ETD through InterLibraryLoan.
Global search from the NDLTD—Networked Digital Library of Theses and Dissertations— Full text ETDs publicly available
OADT: Open Access Theses and Dissertations
Over 3,000,000 open access graduate theses and dissertations from more than 1100 colleges, universities, and research institutions around the world
Theses Canada from Library and Archives Canada
EThOS--Electronic Theses Online Service: UK’s national doctoral thesis service from the British Library
More sources of ETDs