Isso encontrará a palavra "google" (não googles ou googled) e o hiperlink para http:\google.com
Também aplica o estilo
Sub FindAndHyperlink()
'define the style
Dim strStyle As String
strStyle = "Subtle Emphasis"
'set the search range
Dim rngSearch As Range
Set rngSearch = ActiveDocument.Range
'set the search string
Dim strSearch As String
strSearch = "google"
'set the target address for the hyperlink
Dim strAddress As String
strAddress = "http:\google.com"
With rngSearch.Find
Do While .Execute(findText:=strSearch, MatchWholeWord:=True, Forward:=True) = True
With rngSearch 'we will work with what is found as it will be the selection
ActiveDocument.Hyperlinks.Add Anchor:=rngSearch, Address:=strAddress
.Style = ActiveDocument.Styles(strStyle) 'throw the style on it after the link
End With
rngSearch.Collapse Direction:=wdCollapseEnd
'keep it moving
Loop
End With
End Sub
Obviamente, se você quiser passar argumentos, pode fazer isso para que possa ser chamado com seus parâmetros, mas essa é a base do que você precisa.