If you find that Google’s Voice Search getting your words mixed up, there are ways to fix that. According to Lifehacker, one method is to tap on the word you want fixed. That should show three possibilities to replace it with. If those aren’t the words you’re looking for, you tap on the “respeak” button. If you’re going hands-free, you can just say “Ok, Google” and then add “No, I meant ____.” That should replace the word in your last search.
Source: Lifehacker