How did Oskar Schindler buy the Jews in world war 2?

No! Of course not! Irena Sendler is one notable who smuggled Jews out of the Warsaw Ghetto.

The people who saved/hid Jews during the Holocaust are known as The Righteous Of the Nations.

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There were also others, the Righteous Among Nations only lists some of those who rescued Jews. Those not included (for example) are those who took payment (apart for Schindler of course, he is a special case) and those who did not have a surviving Jew to nominate them (as is required to become one of the Righteous).