Sub themsheet()
Dim i, j, k, t As Integer
Do Until j = Sheets.Count
j = j + 1
For i = 1 To Sheets.Count
If Sheets(i).Name = "Tuan" & Right("00" & j, 2) Then k = k + 1
Next i
Loop
sosheet = InputBox("Ban muon them bao nhieu sheet?", "THONG BAO")
Application.ScreenUpdating = False
TryAgain:
On Error GoTo loi
For t = 1 To sosheet
Worksheets.Add
ActiveSheet.Move after:=Sheets(Sheets.Count)
ActiveSheet.Name = "Tuan" & Right("00" & k + 1, 2)
k = k + 1
Next
Exit Sub
loi:
Application.DisplayAlerts = False
ActiveSheet.Delete
k = k + 1
Resume TryAgain
Application.ScreenUpdating = True
End Sub