Today we have plenty of web sites with Tibetan text material – just do a web search with a Tibetan sentence or part of a sentence. In many cases it’s not clear about where the text came from, who edited it, what was the purpose, was this a critical edition or a raw version, does the texts have added typos or misprints and so on. It does not help either that we don’t have a contemporary Tibetan buddhist culture where the source defines the version, similar to the Derge Printing House with its specific Kangyur and Tengyur prints.
It means we need to be careful and use resources and web sites that we know have a history and a known background.
One of these major sites is Tibetan Buddhist Resource Center, or now called Buddhist Digital Resource Center. Thanks to the efforts of Gene Smith this site has millions of scanned pages available as PDF downloads. Today any serious practitioner could apply for an account at this web site. The site is very easy to use, do a search and you will find texts related to the search. Many other sites now also links to the volumes and texts at this site.