Can you just tribute andro sphinx and sphinx telia to summon thienen

No you can't, you can ONLY summon it by the way written in the card.

Theinen the Great Sphinx is a Nomi monster that cannot be Special Summoned in ANY way except by the method printed on the card.


Theinen the Great Sphinx
Light/Beast/10/3500/3000
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by paying 500 Life Points when both "Andro Sphinx" and "Sphinx Teleia" on your side of the field are destroyed at the same time; then you can Special Summon this monster from your hand or Deck. When this card is Special Summoned, by paying 500 Life Points, increase the ATK of this card by 3000 points until the end of the End Phase.