They are not on Anna’s Archive or on MaM. They are available for digital purchase from SpringerPub or Amazon.
Is there a different tracker for textbooks and reference materials?
How likely is it that a request will be fulfilled. Would someone need to buy the book themself and upload it?
Text books are often published separately in Southeast Asia and sold for much cheaper than in the west. They are often paper back and printed on thinner paper but the content is the same. Check out Abebooks or BookFinder.com