Phrase Self-Learning - when you can not find the phrase
you must enable the "Self-Learning" option in preference

Delete	Delete key will invoke the phrase self-learning session as long as current input key buffer is not empty, and try to find phrase/character boundary backward, while presenting the current active choice list. If self-learning session already reach the beginning of the input buffer, the learning session will be removed.
Space	Space key confirms the currently displayed choice, and move the self-learing forward to next input buffer segment. If self-learning session already reach the end of the input buffer, the currently displayed phrase will be added to the active phrase dictionary.
Return/Enter	Return/Enter key confirms the currently active phrase displayed, and added to the active phrase dictionary without further looking up the input buffer.
Number/Arrow	When a choice list is presented, use the number key to navigate through the list, if you will find the right selection, hit "space" to confirm the selection and move forward, or if you can not find the right selection, hit "delete" to move the session one step backward.