An unfounded assumption, as displaying Word's formatting marks would immediately show.
Your files have quite different structure: one has 'JOURNAL of MEDICINE and LIFE' in the document body; the other has it in the header. Moreover, some of your titles span more than one paragraph. Consequently, you can't work from a paragraph # (4 in one document, 7 & 8 in the other). Instead, you need to use Find to locate the text.
Since your two examples have the titles in the Normal Style and a bold font, try:
Sub Demo()Application.ScreenUpdating = False Dim Rng As Range With ActiveDocument.Range With .Find .ClearFormatting .Replacement.ClearFormatting .Text = "" .Replacement.Text = "" .Font.Bold = True .Style = wdStyleNormal .Forward = True .Wrap = wdFindStop .Format = True .MatchWildcards = True End With Do While .Find.Execute If Rng Is Nothing Then Set Rng = .Duplicate Else If Rng.End + 1 = .Start Then Rng.End = .End Else Exit Do End If End If Loop MsgBox Rng.Text End With Application.ScreenUpdating = True End Sub