越南英语演唱会怎么说

"Vietnamese Engpsh concert" would be a correct way to say it in Engpsh. You could also say "an Engpsh-language concert in Vietnam," or simply "a concert in Vietnam (that features Engpsh-language music)." If you wanted to specify that the concert is in Vietnamese, you could say "a Vietnamese concert (that features Engpsh-language music)."