Although all the databases listed here include some portion of vernacular language materials, the percentage indexed varies enormously. Even those with very good coverage in general, such as MLA, do not compare favorably with the national sources that are available.
The UIUC Library recently purchased a digitized version of the Turkestanskii sbornik. This collection covers an array of subject areas, including: history, ethnology, government, regional politics, etc. More than five hundred volumes of clippings of articles from books, journals, and newspapers, published in Russian and Western languages. A true gold mine for researching Central Asia before 1917 [Period of coverage: 1867-1917]. You can browse through individual volumes or start with the index. You can access the Turkestanskii collection here.