Want more lands from China ?? U think people want a dirty, barren, polluted land like China ?? In History, VN emperor always went to the South and West when VNese want more fertile lands, no Emperors chose China barren, polluted land
It was believed that the tiger would intervened to relieve pressure on Vietnam ?? So, wrong belief . We didnt need Soviet troops even when against mighty US, so let alone poor trained-poor discipline PLA in 1979.
Just bcz China didnt declare war before attack VN, thats why lots of VN civilians including pregnant women, kids died when u attacked us and withdraw before our elite troops could arrive to the border.