I am looking for an answer , I had provided [just for reference] , but I couldn't find it on SO.
How can I search such answers ?
When the question has been moved to another site (like superuser.com) you do not get informed about it. I know of no way to find out where that question went
You cannot search for deleted content. If the question is not deleted, search for the question, and you should be able to view your answer.
If the question is also deleted then if you provide sufficient information about the answer then you might be able to convince a moderator to help you find the question and post the content of you answer here, though they are busy.
If you have a link to the question, other 10k users can do the same, but we can't search deleted content.