Try the following:
- Use different phrasing or notations
- Enter whole words instead of abbreviations
- Avoid mixing mathematical and other notations
- Check your spelling
- Give your input in English
Other tips for using Wolfram|Alpha
- Wolfram|Alpha answers specific questions rather than explaining general topics(e.g. Enter "2 cups of sugar", not "nutrition information")
- You can only get answers about objective facts(e.g. Try "highest mountain", not "most beautiful painting")
- Only what is known is known to Wolfram|Alpha(e.g. Ask "how many men in Mauritania", not "how many monsters in Loch Ness")
- Only public information is available(e.g. Request "GDP of France", not "home phone of Michael Jordan")