To search for a specific message in a Teams conversation, here are the steps to follow:

1. Go to the conversation
   Open the Teams channel for the conversation.
2. Select the Search this chat icon
   It is located to the right of the compose message box at the bottom of the conversation.
3. Enter desired keywords
   Type in the words or phrases you are searching for.
4. Click enter
   To view the search results.
5. Perform refining search
   You can refine your search results by clicking the Search Options dropdown and selecting Include this search in results.