Several dedicated channels and archival accounts have uploaded snippets or full VHS-rips of these episodes. Search for "Doraemon 1979 Hindi" or "Old Doraemon Hungama TV rip." However, these are often taken down due to copyright claims, so collectors move fast.
Tracking down the exact 1999 broadcast order in Hindi can be tricky because Indian networks aired them out of sequence. However, you can find them via: doraemon old episodes in hindi 1999