The Haftarah of VaYeishev is from Amos, one of the smaller books in Trei Asar.
Often, VaYeishev comes out on Chanukah, and the special Chanukah Haftarah is read instead.
Linear Annotated Translation of the Haftarah of VaYeishev
The main connection to the Parsha is based on the first verse of the Haftarah, which Chazal interpret as referring to the sale of Yosef.