Use the same code you already have to build the array, then search the
array. Here is some simple code to get you going (Of course, I have to build
an array just to show you how to search the array... You would repalce the
array building code I have with your own and modify the searching code
appropriately):

Sub FindArrayValue()

Dim strArray(2, 2, 2) As String
Dim i As Long
Dim j As Long
Dim k As Long
Dim strValue As String
Dim str0 As String
Dim str1 As String
Dim str2 As String

i = 0
j = 0
k = 0
For i = 0 To 2
   For j = 0 To 2
       For k = 0 To 2
           strArray(i, j, k) = i & "_" & j & "_" & k
       Next
   Next
Next

strValue = InputBox("What Variable are you looking for (""x_y_z"" where
numbers must be between 0 and 2)?", "Get value")

i = 0
j = 0
k = 0
For i = 0 To 2
   For j = 0 To 2
       For k = 0 To 2
           If strArray(i, j, k) = strValue Then
               str0 = strArray(i, j, 0)
               str1 = strArray(i, j, 1)
               str2 = strArray(i, j, 2)
               Exit For
           End If
       Next
   Next
Next

MsgBox "The three variables associated with """ & strValue & """ are """ _
   & str0 & """, """ & str1 & """ and """ & str2 & """.", _
   vbInformation, "Results"

End Sub