Type your search into the search box at the top right of the screen:
When searching for attachments by name, the file extension is considered part of the last word in the name. So, entering answerstest will not bring up answerstest.docx because answerstest is not the full string. To retrieve this attachment, you must use answerstest.docx or the wildcard character (so a partial string matches): answerstest*
More Advanced Searching
Use double quotes around the phrase. Ex: "cell phone" will search for pages containing that exact phrase instead of the word "cell" and "phone" anywhere in the document.
"Outlook 2010" AND SUmail
From the search results screen, you can get help by selecting the question mark next to the search box
If your search returns a large number of results, you may want to use one of the search filters available on the search results screen. You can filter by author, space, when the page/attachment was last modified, or content type. A filter becomes effective as soon as you select it.