Text Search allows you to search across documents, if they have been coded or not. So, for example, you may remember that you have a document with a particular street name in it but you don't remember which document this name is in. A Text Search will search across all your documents and pull all the instances of that street name for you. You can then make decisions about how and what to code.
To get to Text Search:
You can autocode from your Text Search results. Autocoding allows you to code multiple documents at the same time in a uniform way. However, a word of caution about autocoding: it is imperfect and can complicate your data analysis later.