His explanation is always clear.

His explanations are always clear and easy to understand.

It is said that he has returned from the underworld.

This math problem requires a clear explanation.

I plan to go to Vietnam next year.

I have been to the Republic of Vietnam.

My country is blessed with beautiful nature.

He has many Vietnamese friends.

He was born and raised in North Vietnam.

He appealed for a reexamination of the judgment.