In Doctor Zhivago, explain why after arriving in Moscow, Yurii does not try to get back to his family nor seek to find Lara.

At this point in the novel, Yurii is only a shell of his
former self.  Whereas there was a point where Yurii lived for beauty and the love of
what was in the world, Yuri's arrival in Moscow has become the result of ruptured bonds,
misplaced loyalties, as well as governmental hypocrisy. At his arrival in Moscow, this
hypocrisy is at its most unprecedented level, as power is not being exercised for the
benefit of the many.  It is being used to benefit the few.  Yurii is reflective of how
the body politic's loyalty is being tried and
weakened:

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It is 1922, and Yurii returns to the
city a broken man...Vasia watches as Yurii turns more and more inward, away from life
and passion. After settling in, Yurii is further disappointed by his former friends, who
are, in Yurii’s eyes, mere shadows of the people they once
were.

At this
point in the novel, Yurii has lost all energy to find totality and harmony in
consciousness.  Hope is lost with the purges and abuses of central power, causing him to
lose hope as a citizen and person.  While writing used to be a communal product for him,
the ending reflects him to be one that can only write for himself, seeking to remain
only with himself and not form any bonds with anyone
else:

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By the end of the story, Yurii has
withdrawn from society, from the two women who matter most to him, and from his children
and his friends. He has withdrawn from society and into his writing. In the end, he
lives in a small room where he sorts through and records his thoughts. He dies on a
public sidewalk away from everyone he has ever
known.