If modification of the tree is allowed then each query can be solved in 
O(height).
find(node, k) {
  if (count(node->left) + 1 == k) result = node;
  else if (count(node->left) < k) result = find(node->right, k 
- count(node->left) - 1);
  return find(node->left, k);
}

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