Clearly utter a complete sentence. Make corrections, if necessary. If you want to continue, click on the "microphone" and utters the following sentence. Etc.
Message is ready. Choosing a recipient from the contact list or directly typing the e-mail address / telephone number and send.
Easy, fast, convenient.
Recommendation: Use short telegraphic type sentences.
For proper speech recognition is necessary in the settings of the mobile device in the " Language & input " in " Voice Search " to set the language . Also there has a menu item " Speech Recognition offline". Recommended to download the language files for better performance and standalone applications(Android 4.1 and higher). Also on some versions of Android (usually Chinese device) is not pre-installed package GOOGLE Voice Search. Necessary to install it from Google Play!