Sobranie sochineniĭ v semi tomakh / Marina T︠S︡vetaeva ; [sostavlenie, podgotovka teksta i kommentarii Anny Saaki︠a︡nt︠s︡ i Lʹva Mnukhina]. (OCLC #39019008)
Volumes of collected works may be more prominently decorated with the author’s name, which may not be recorded in the title field at all. This creates a challenge in copy cataloging of foreign language materials; if you don’t recognize “Marina Tsvetaeva” as a name, or don’t yet know that “Sobranie sochinenii” means “collected works”, what seems like the obvious search query may not retrieve the best (or any) records.
If you’re not finding copy for what appears to be a commonly available book, try multiple searches before giving up.