Que huong la chum khe ngot?

Yes,It's a lyric of "Quê Hương", a famous song about one's father land. The song was written by Đỗ Trung Quân.

The last verse is "Quê hương nếu ai không nhớ, sẽ không lớn nổi thành người", meaning if one doesn't "remember" one's fatherland, one hasn't grown fully as a human.

One of the places to listen to the song is here: http://mp3.zing.vn/bai-hat/Que-Huong-La-Chum-Khe-Ngot-Cam-Ly/IW6BUZO8.html