Here you typically want to search across elements, so that the above paragraph would match a search for <code>real text</code>. For more examples, see [http://www.w3.org/TR/xpath-full-text-10-use-cases/#Across XQuery and XPath Full Text 1.0 Use Cases].
To enable this kind of searches, ''whitespace chopping'' must be turned off by setting the option <code><[[Options#CHOP|CHOP]]</code> to <code>OFF</code> (default: <code>SET CHOP ON</code>). In the GUI, you find this option in Database → New… → Parsing → Chop Whitespaces.
A query such as <code>//p[. contains text 'real text']</code> will then match the example paragraph above.