private void họcViênToolStripMenuItem_Click(object sender, EventArgs e)
{
if (Kiemtraform("frmTimcobanHV") == false)
{
frmTimHV frmTimhv = new frmTimHV();
frmTimhv.Name = "frmTimcobanHV";
frmTimhv.MdiParent = this;
frmTimhv.Show();
}
}
