Here's a sample Excel macro that counts the number of matches and writes it down next to the sought-for strings. I tried it with Office 2007, but it should work with 2003 as well. The macro uses regular expressions, so you need to add a reference to the "Microsoft VBScript Regular Expressions" library to your VBA project (Visual Basic Editor -> Tools -> References).
Sub GetMatchCount()
Dim Text, i, re
' Replace with your Word document name
Const WordFileName = "C:\Test.doc"
With CreateObject("Word.Application")
.Documents.Open (WordFileName)
Text = .ActiveDocument.Range.Text
.Quit
End With
Set re = New RegExp
re.Global = True
With ActiveSheet.UsedRange
For i = 1 To .Rows.Count
re.Pattern = .Cells(i, 1).Value
.Cells(i, 2).Value = re.Execute(Text).Count
Next
End With
End Sub