Dysarthria effects your speech and can make your speech, hoarse, breathy and often unintelligible. One simple strategy to use to help people to understand you is to use an alphabet chart.  Naturally you can use this to spell words out if you are not understood. 

However, a quicker way is to just point to the first sound of the word you are trying to say. 
When the listener knows the first sound they can often cue into the rest of the word as you say it by listening to your speech and intonation, and using the context of the conversation.