2 sentences

1. 你们的退货政策是什么？

   nǐ​men de tuì​huò zhèng​cè shì shén​me?

   What's your return policy?

   Source: OpenSubtitles

2. 如果收到商品后不满意，可以申请退货。

   rú​guǒ shōu​dào shāng​pǐn hòu bù mǎn​yì, kě​yǐ shēn​qǐng tuì​huò.

   If you are not satisfied with the product upon receipt, you can apply for a return.

   Source: Dong Chinese Dictionary