vb.net list active directory groups

Hi

I have problem with this code, some how i cant list all groups from domain.
Problem is that i have 70 groups in ad, example 10.100.product and 11.255.product .. etc...
but when im runnign this code it will only show me 42 groups so half of groups are missing, where could be the problem?

Imports System.DirectoryServices
Public Class Form1

    Public Shared Function GetDirectoryEntry() As DirectoryEntry

        Dim dirEntry As New DirectoryEntry("LDAP://domain")
        dirEntry.Username = Nothing
        dirEntry.Password = Nothing
        dirEntry.AuthenticationType = AuthenticationTypes.Secure
        Return dirEntry
    End Function

    Public Shared Function GetDirectorySearch() As DirectorySearcher
        Dim dirEntry As DirectoryEntry = GetDirectoryEntry()
        Dim dirSearcher As DirectorySearcher = New DirectorySearcher(dirEntry)
        Return dirSearcher
    End Function

    Private Sub exportfromad_Click(sender As System.Object, e As System.EventArgs) Handles exportfromad.Click
        Dim de As DirectoryEntry = GetDirectoryEntry()
        Dim deSearch As DirectorySearcher = New DirectorySearcher()
        deSearch.SearchRoot = de
        Dim test As String
        Dim count As Integer
        deSearch.Filter = "(&(objectClass=group) (samAccountName=" & "*" & "))"
        Dim results As SearchResultCollection = deSearch.FindAll()
        For Each r As SearchResult In results
            Try
                If r.GetDirectoryEntry.Name.Contains("product") Then
                    count += 1
                    test += r.GetDirectoryEntry.Name & vbCrLf
                End If
            Catch
            End Try
        Next
        MsgBox(test)
        MsgBox(count)
    End Sub
End Class

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