trời ơi

Meaning

1. oh my!

   interjection

   oh my, oh no, good heavens

   Very common for surprise, delight or dismay; often shortened to Trời!

   • Trời ơi, nóng quá!

     Oh my, it's so hot!

   • Trời ơi, em quên rồi!

     Oh no, I forgot!