You may wish to stop your voice search settings blocking certain words. If you are using Sense 3.0 (Android 2.3.4), follow these steps to configure your voice search settings:

1. Navigate to Menu > Settings > Voice Input & Output > Voice recognizer settings.
2. Uncheck Block offensive words.

If you are using Sense 4.0 or later, follow these steps to configure your voice search settings:

1. Drag down the notifications bar and tap Settings.
   Alternatively, navigate to All Apps > Settings.
2. Navigate to Language & Keyboard > Voice Search.
3. Uncheck Block offensive words.