Merge pull request #1 from baloctran/master

Up view cho e ne Thao
Up code

_ Show list country , shool : completed
_ Show list student : can't display country'sname and school's name
_ Add/Edit country , school , student : completed
_Delete country , school, studet: can't execute
up code administrator
Merge pull request #1 from hpthao1090/master

A get code cua e ve ne :D