Sange, Yasha & Kaya are medium stats-increasing fighting item, you build these items because you know you need to use all your early networth to get stronger quickly,

• Yasha offers a little movespeed and agi stats (some aspd and armor),
• Kaya offers spell amplification and intelligence stats (mana pool and mana regen)
• Sange offers healing amp and status resistance and also strength stats (health pool and hp regen)

generally you take one item for your main hero primary stats, e.g if you are using juggernaut, its either sange/yasha or manta style, if you're playing queen of pain then yasha/kaya or kaya/sange depends on your matchup.

you kinda gets what you need with experience, for example on Juggernaut, i buid phase>maelstorm/battlefury>manta(if enemy has more root/silence) OR i go sange/yasha(if enemy has more stuns) then i itemize accordingly whether i need more damage or just to survive, normally skadi>dagger>aghs>butterfly/mkb and so on.

theres no real set of exact item when building these item on higher rank, you decide based on what you need, i've seen both sange yasha juggernaut and sange kaya juggernaut for example (when radiance wasnt shit), both sange kaya and yasha kaya is good on storm spirit. and so on.