Revisit similarity measure on similar documents

[MrOrz]

Given this message:
https://cofacts.g0v.tw/article/s7m91ju27j4w

We cannot find the related article:
https://cofacts.g0v.tw/article/1lqxc09h1vbqw
https://cofacts.g0v.tw/article/3ubqbfcz0u49h

Even though all of them contains identical URLs

[MrOrz]

https://cofacts.g0v.tw/article/3ehvvrsuaf7bg
Has no related articles, but it's content is highly related with:

https://cofacts.g0v.tw/article/AWCHK3peyCdS-nWhult4

[MrOrz]

This article has no related article:
https://cofacts.g0v.tw/article/rn4n0ke1sonh

But this article have:
https://cofacts.g0v.tw/article/2yxg9uyddjuqq

Using the word "震驚全球冤案！21歲選美冠軍「好心幫朋友帶書回國」，警方一翻開書「直接判她死刑」！" in "Search", cannot find article either.

[MrOrz]

Totally similar but not inside

https://cofacts.g0v.tw/article/42xl6djfs1pe
https://cofacts.g0v.tw/article/2rgcsk631rtzh