I would like to identify the copied text in a typed text in word document.

The context of the question is I have typed a letter i.e., running matter(sensitive).  In which a modification has been done what i suspect.  Now I want to know how to identify that copied text from some other word file, into my word document, by means of code mismatch etc., etc., I want to know exactly that particular copied text to be identified by me by any means.  Googling suspicious phrases cannot be practical as it has been tactfully modified to ensure no suspicion arises.  Since the gist of the letter is contradicting, I am forced to find exact words/letters modified in the file by means of code etc., i.e., scientifical way.  please provide me some concrete solution on this issue.

Thanks.

If the text has specific formatting applied to it, you can search for the formatting via the Find and Replace dialog box (Ctrl+H). Other than that, pasted text is no different from text that has been typed into a document.

On the other hand, if you are saying that you are reading texts written by other people and you want to make sure there is no plagiarism involved, googling for suspicious phrases is usually helpful.

If you have the unmodified original document then see - http://www.codejacked.com/comparing-two-versions-of-a-word-document/