Clicking in the Search box will open the Search tab and you can refine your search using the commands in the Refine group. You are not limited to searching using one Refine command, you can select multiple search parameters.
Available search parameters include From, Subject, Has Attachments, Categorized, Flagged and Important etc.
The Search Tools button in the Options group opens a menu which offers different search tools.
Opening the Advanced Find dialog box allows you to personalise your options.