Visual Basic - Error de sintaxis (falta operador) en la consulta

Dim Filtro As String

Filtro = "Carrera = '" & Me.Cuadro_combinado332 & "' and Nota 1 > " & 3 & " and Nota 2 > " & 3 & " and Nota 3 > " & 3 & " and Nota 4 > " & 3 & " and Egresado = 0"

Me.Filter = Filtro

Me.FilterOn =True

Private Sub DBCombo1_Change()

 Dim C As String

 C = "NOMBRE'" + DBCombo1 + "'"

DatClientes.Recordset.FindFirst C      "Aquí es donde me sale el error"

 DBGrid1.Visible = False

  If DatClientes.Recordset.NoMatch = 6 Then

   FmaDatos.Visible = False

  Else

   FmaDatos.Visible = True

   End If

 End Sub

Private Sub DBCombo1_Change()

    Dim C As String

    C = "NOMBRE = '" + DBCombo1 + "'"

    DatClientes.Recordset.FindFirst C      "Aquí es donde me sale el error"

    DBGrid1.Visible = False

    If DatClientes.Recordset.NoMatch = 6 Then

        FmaDatos.Visible = False

    Else

        FmaDatos.Visible = True

    End If

End Sub