public bool TrongTruongSo12() { bool kq; if (UcNatsuItem1.KiemTraTruongSo12() || UcNatsuItem2.KiemTraTruongSo12() || UcNatsuItem3.KiemTraTruongSo12() || UcNatsuItem4.KiemTraTruongSo12() || UcNatsuItem5.KiemTraTruongSo12()) { kq = true; } else { kq = false; } return(kq); }